For one thing, ? expressed his belief that Yunalesca was a Cult Leader last Day, so if he still believed that at Night, attacking Yunalesca really is the only reasonable thing for him to do. For another, I think this game is too small to have three killing roles, unless they're all pretty limited. This could be the case - we know ?'s ability was limited by success. We also know that for some reason the mafia didn't kill anybody on Night 1.

Still, I think the likeliest explanation is that the scum killed ? and ? killed Yunalesca.

Although, Yuna being, in my eyes at least, pretty much confirmed non-mafia makes her an important target to dispose of, while ? remained quite suspicious and lynchable after yesterDay.