Putting aside the fact that he's wandering down a dark tunnel half-naked, Everil doesn't present as delusional. Zangua doesn't see anyone else behind him.
Everil smiles. "The nature of the Ways? Such a question as I ask myself every day, every night. And who am I to answer it? The Ways are naught but empty spaces in the darkness, in the earth, from the great hollows made by the Borer of Old to the vines of the kings who came before me. Its nature is only that of those who inhabit it, even if only for a little time. What is the nature of the Ways, you ask? I ask you in turn: what is your nature?" He pauses for a moment, then waves off his own question with a chuckle. "You don't have to answer that, of course. Your concern is for your missing friend, I understand. Again, nothing would please me more than to deliver a message of good hope to her if her path and mine should cross. May I ask, what is her name?"