That sounds like a swamp thing, a "green man". A bit of an assholish thing to do in Alec's mind, but he doesn't want to kill the superstition. The more human beings fear the green the better.

If he still had a gut, it would have clenched in anger at that sudden thought in his mind.

"You did the right thing and I'm glad it helped. I'm not the green man, but he might be..." family? "Similar. To what I am."