It's the first time you've been switched with MadDog, at least by me.
I thought MadDog would be a target for the mafia (and he was) and you had said that you were going to be protecting yourself. So I thought a good way to protect MadDog would be to make anyone targeting him target you instead - and hopefully you'd be protected by yourself.
It's one of the only actual useful things I could've done with my power. Unless by some luck I manage to re-target the killer to target a fellow mafioso, my power doesn't really help all that much.
Now that Zell has been found to be mafia I don't think there's much reason to suspect Jayseven. We've got one straight protector, one jailkeeper and one investigator/protector. Probably all townie.