“I was expecting you, Master Wormtongue.” The man started at that name. “Gandalf got here first. So I know as much about you as I need, and I know what to do with you. Put all the rats in one trap, said Gandalf; and I will. I am the master of Isengard now, but Saruman is locked in his tower; and you can go there and give him all the messages that you can think of.”

‘“ Let me go, let me go!” said Wormtongue. “I know the way.”

‘“ You knew the way, I don’t doubt,” said Treebeard. “But things have changed here a little. Go and see!”

‘He let Wormtongue go, and he limped off through the arch, with us close behind, until he came inside the ring and could see all the floods that lay between him and Orthanc. Then he turned to us.

‘“ Let me go away!” he whined. “Let me go away! My messages are useless now.”

‘“ They are indeed,” said Treebeard. “But you have only two choices: to stay with me until Gandalf and your master arrive; or to cross the water.”

“I should like to know who this Wormtongue is. Was he really the king’s counsellor?’

‘He was,’ said Aragorn; ‘and also Saruman’s spy and servant in Rohan. Fate has not been kinder to him than he deserves. The sight of the ruin of all that he thought so strong and magnificent must have been almost punishment enough. But I fear that worse awaits him.’”

“He [Gandalf] raised his hand, and spoke slowly in a clear cold voice. ‘Saruman, your staff is broken.’ There was a crack, and the staff split asunder in Saruman’s hand, and the head of it fell down at Gandalf’s feet.

‘Go!’ said Gandalf. With a cry Saruman fell back and crawled away. At that moment a heavy shining thing came hurtling down from above. It glanced off the iron rail, even as Saruman left it, and passing close to Gandalf’s head, it smote the stair on which he stood. The rail rang and snapped. The stair cracked and splintered in glittering sparks. But the ball was unharmed: it rolled on down the steps, a globe of crystal, dark, but glowing with a heart of fire. As it bounded away towards a pool Pippin ran after it and picked it up.

‘The murderous rogue!’ cried Éomer. But Gandalf was unmoved.

‘No, that was not thrown by Saruman,’ he said; ‘nor even at his bidding, I think. It came from a window far above. A parting shot from Master Wormtongue, I fancy, but ill aimed.’

‘The aim was poor, maybe, because he could not make up his mind which he hated more, you or Saruman,’ said Aragorn.

‘That may be so,’ said Gandalf. ‘Small comfort will those two have in their companionship: they will gnaw one another with words. But the punishment is just. If Wormtongue ever comes out of Orthanc alive, it will be more than he deserves.”

“Strange are the turns of fortune! Often does hatred hurt itself! I guess that, even if we had entered in, we could have found few treasures in Orthanc more precious than the thing which Wormtongue threw down at us.’ A shrill shriek, suddenly cut off, came from an open window high above.
‘It seems that Saruman thinks so too,’ said Gandalf. ‘Let us leave them!’”

“The beggar turned and slouched past whimpering: ‘Poor old Gríma! Poor old Gríma! Always beaten and cursed. How I hate him! I wish I could leave him!’

‘Then leave him!’ said Gandalf. But Wormtongue only shot a glance of his bleared eyes full of terror at Gandalf, and then shuffled quickly past behind Saruman.”

“He [Saruman] walked away, and the hobbits made a lane for him to pass; but their knuckles whitened as they gripped on their weapons. Wormtongue hesitated, and then followed his master.

‘Wormtongue!’ called Frodo. ‘You need not follow him. I know of no evil you have done to me. You can have rest and food here for a while, until you are stronger and can go your own ways.’ Wormtongue halted and looked back at him, half prepared to stay.

Saruman turned. ‘No evil?’ he cackled. ‘Oh no! Even when he sneaks out at night it is only to look at the stars. But did I hear someone ask where poor Lotho is hiding? You know, don’t you, Worm? Will you tell them?’

Wormtongue cowered down and whimpered: ‘No, no!’ ‘Then I will,’ said Saruman. ‘Worm killed your Chief, poor little fellow, your nice little Boss. Didn’t you, Worm? Stabbed him in his sleep, I believe. Buried him, I hope; though Worm has been very hungry lately. No, Worm is not really nice. You had better leave him to me.’
A look of wild hatred came into Wormtongue’s red eyes. ‘You told me to; you made me do it,’ he hissed. Saruman laughed. ‘You do what Sharkey says, always, don’t you, Worm? Well, now he says: follow!’

He kicked Wormtongue in the face as he grovelled, and turned and made off. But at that something snapped: suddenly Wormtongue rose up, drawing a hidden knife, and then with a snarl like a dog he sprang on Saruman’s back, jerked his head back, cut his throat, and with a yell ran off down the lane. Before Frodo could recover or speak a word, three hobbit-bows twanged and Wormtongue fell dead.”

"And at all times they smell the blood of living things, desiring and hating it."

“See, Théoden, here is a snake! With safety you cannot take it with you, nor can you leave it behind. To slay it would be just. But it was not always as it now is. Once it was a man, and did you service in its fashion. Give him a horse and let him go at once, wherever he chooses. By his choice you shall judge him.’”

"Once it was a man"

"Your leechcraft ere long would have had me walking on all fours like a beast."

"Well, I think the point is actually as Tolkien would say. "I did that, to show people who were bewildered, because that's the way things are in reality. We never know entirely what's going on. Our fates are affected by other people decisions. But we don't know about the decisions and maybe we'll never find out."

...He says, "All we have to decide is what to do with the time that is given us". All we have to do is decide what we're going to do. Do not think about other people. Once you start making your decisions on the basis of what you think other peoples decisions will be, you are speculating. And when you start speculating, you will inevitably get it wrong. You will actually frighten yourself, and drive yourself to wrong conclusions. Like Denethor and indeed like Sauron. Well, I think actually in the book all that's quite clear. It's a statement about the way events are in the real world. It's telling you what is the right procedure in the real world. But in the movies, it's quite different....

"Tolkien Book to Jackson Script: The Medium and the Message" . Here is a link to the transcript

“‘If this is bewitchment,’ said Théoden, ‘it seems to me more wholesome than your whisperings. Your leechcraft ere long would have had me walking on all fours like a beast.”

You should consider the possibility of vampires in LotR. It makes more sense than you might think if you consider the concept and the set of traits that lie behind the word instead of just the word.

I just did some work with the vampire theory text file and achieved significant structural improvements and a bit of added text. I won't be able to publish the proper theory post any time soon though. There is still a lot to write, even though I'm trying to keep it concise.

Your games with semantics are not convincing to anyone.

‘No, not dead, so far as I know,’ said Treebeard. ‘But he is gone. Yes, he is gone seven days. I let him go. There was little left of him when he crawled out, and as for that wormcreature of his, he was like a pale shadow. Now do not tell me, Gandalf, that I promised to keep him safe; for I know it. But things have changed since then. And I kept him until he was safe, safe from doing any more harm. You should know that above all I hate the caging of live things, and I will not keep even such creatures as these caged beyond great need. A snake without fangs may crawl where he will.’

‘You may be right,’ said Gandalf; ‘but this snake had still one tooth left, I think. He had the poison of his voice, and I guess that he persuaded you, even you Treebeard, knowing the soft spot in your heart. Well, he is gone, and there is no more to be said.’

“It is wisdom to recognize necessity, when all other courses have been weighed, though as folly it may appear to those who cling to false hope. Well, let folly be our cloak, a veil before the eyes of the Enemy! For he is very wise, and weighs all things to a nicety in the scales of his malice. But the only measure that he knows is desire, desire for power; and so he judges all hearts.”

“‘The treacherous are ever distrustful,’ answered Gandalf wearily.
‘But you need not fear for your skin. I do not wish to kill you, or hurt you, as you would know, if you really understood me.”

‘Yes,’ said Gorbag. ‘But don’t count on it. I’m not easy in my mind. As I said, the Big Bosses, ay,’ his voice sank almost to a whisper, ‘ay, even the Biggest, can make mistakes. Something nearly slipped, you say. I say, something has slipped. And we’ve got to look out. Always the poor Uruks to put slips right, and small thanks. But don’t forget: the enemies don’t love us any more than they love Him [Sauron], and if they get topsides on Him, we’re done too.”

“Saruman rose to his feet, and stared at Frodo. There was a strange look in his eyes of mingled wonder and respect and hatred. ‘You have grown, Halfling,’ he said. ‘Yes, you have grown very much. You are wise, and cruel. You have robbed my revenge of sweetness, and now I must go hence in bitterness, in debt to your mercy. I hate it and you!”

“He raised his hand, and spoke slowly in a clear cold voice. ‘Saruman, your staff is broken.’ There was a crack, and the staff split asunder in Saruman’s hand, and the head of it fell down at Gandalf’s feet. ‘Go!’ said Gandalf. With a cry Saruman fell back and crawled away.