That's why we're going to hand him over to Queen Elphame. She's the one who originally had him interred in the Forest of the Felled, so she's probably the best-equipped person on the island to decide what to do with him.

[He'd like to smoke, but he's worried about accidentally lighting up some swamp gas, so he refrains.]

The fae can't be trusted to look out for our kind, but it can't be in their own best interest either that the guy devastates one area after the other.