I think he's probably a villager as wolf Yak doesn't really do these things.
The problem is that we have new players/people who don't have the externsive experience with him we have, and they tend to fall for his idiocy. Wasn't it last game that it ended up costing two villagers, before Yak himself then was hung? Hence it's basically minimising the damage. When Yak does this thing it usually leads to the death of a villager or two before he's strung up himself, so I'm suggesting we skip the innocent villagers dying step.