But no living man am I!

"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'"

The Battle of the Pelennor Fields - The Return of the King
The Lord of the Rings - JRR Tolkien (1955)
Harper Collins