That's kinda why I consider Ethan town. Because if he's Wolf either a) Fed is Wolf and faked the check (so why would Ethan vote there and defend Marten?) or b) Marten is Firebug (so why would Ethan save the enemy?)
There are probably more scenarios, but I feel like one of Marten or Fed have to be scum, or? Like, if Fed is Town Marten is always scum, and if Marten is Town Fed is always scum?