"Yrwk?" says Steve, in reply to the first sentence, because whilst 'Sylars-killing-people' might not be a revelation, 'hi-I-was-one-of-them' is an unpleasant thing to be told. Were it not for the particularly un-Sylar-like tone of confession, he's be making his excuses right then and there.

And from anyone not a viciously unrepentant serial murderer, that's a story to inspire pity. Hell, Steve suspects that you could even remove the disclaimer altogether.

...his face isn't quite sure what to do with itself.

Much like the rest of him.

"...God," will do for a start. It's chiefly sympathetic in tone.