[blantyr]

"Then suddenly, as before under the eaves of the Emyn Muil, Sam saw these two rivals with other vision. A crouching shape, scarcely more than the shadow of a living thing, a creature now wholly ruined and defeated, yet filled with a hideous lust and rage; and before it stood stern, untouchable by pity, a figure robed in white, but at its breast it held a wheel of fire. Out of the fire there spoke a commanding voice.

'Begone, and trouble me no more! If you touch me ever again, you shall be cast yourself into the Fire of Doom.'"

See Did the Ring speak on Mount Doom?, an article on an obscure Tolkien web site.

As I've stated before, before many physical battles, there is an exchange of prophecy that often foreshadows the result of the conflict. Examples...

"By Elbereth and Luthien the Fair, you shall have neither the Ring nor me!"

"You shall not pass!"

Then there is my favorite example, a non-mage speaking Words of Power.

"Begone, foul dwimmerlaik, lord of carrion! Leave the dead in peace!"

A cold voice answered: "Come not between the Nazgûl and his prey! Or he will not slay thee in thy turn. He will bear thee away to the houses of lamentation, beyond all darkness, where thy flesh shall be devoured, and thy shrivelled mind be left naked to the Lidless Eye."

A sword rang as it was drawn. "Do what you will; but I will hinder it if I may."

"Hinder me? Thou fool. No living man may hinder me!"

Then Merry heard of all sounds in that hour the strangest. It seemed that Dernhelm laughed and the clear voice was like the ring of steel. "But no living man am I! You look upon a woman. Éowyn I am, Éomund's daughter. You stand between me and my lord and kin. Begone, if you be not deathless! For living or dark undead, I will smite you if you touch him."

Then there is the one where you have to remember that in Gondor, the first hour of the day begins with sunrise. Here again the Lord of Nazgul is slain with Words.

"You cannot enter here," said Gandalf, and the huge shadow halted. "Go back to the abyss prepared for you! Go back! Fall into the nothingness that awaits you and your Master. Go!"

The Black Rider flung back his hood, and behold! he had a kingly crown; and yet upon no head visible was it set. The red fires shone between it and the mantled shoulders vast and dark. From a mouth unseen there came a deadly laughter.

"Old fool!" he said. "Old fool! This is my hour. Do you not know Death when you see it? Die now and curse in vain!" And with that he lifted high his sword and flames ran down the blade.

And in that very moment, away behind in some courtyard of the city, a cock crowed. Shrill and clear he crowed, recking nothing of war nor of wizardry, welcoming only the morning that in the sky far above the shadows of death was coming with the dawn.

And as if in answer there came from far away another note. Horns, horns, horns, in dark Mindolluin's sides they dimly echoed. Great horns of the north wildly blowing. Rohan had come at last.

In Middle Earth, Words have Power. A good deal of the subtle or not so subtle magic comes from the Words exchanged before conflict, in shaping the result before the conflict begins. In the last above example, the Witch King had to kill Gandalf "now" or his master would fall into nothingness. Gandalf wasn't just defending the gate. He was swinging for a home run. The moment the Witch King turned from the gate, when he left Gandalf unslain, his master was doomed.

To me, "If you touch me ever again, you shall be cast yourself into the Fire of Doom" is a prophecy, warning and command given by the Ring itself, in the spirt of it's creator, Sauron. It is to me significant that while all the free peoples from Gandalf to Bilbo to Frodo to the Elves of Mirkwood, to Faramir to even Sam, all showed Gollum mercy, the Ring, a proxy for Sauron, did not.

Now, it could be that this was influenced by Eru or one of the Valar as well, but to me it seems that evil destroyed evil. The Ring destroyed itself as a result of its own destructive malice. That is a major theme of the work from my perspective. To me, the Valar having to intervene at that moment would reduce the sense of wonder.