Vitek: I played traitor many games back here.
I started as town, but I wasn't able to win with town. I had to join scum team in order to win.
I had ability to send message to someone once per game, to tell them I want to join mafia. They had option to target people and if they targeted me (even randomly, without my message), I would join them.
I got vigged N1 by Red_Baron, though. :-)
It would quite nicely explain why there were only 3 mafias in 15 players game. They had chance to increase their numbers but it was not warranted. So it was like 3,5 people mafia team.
It doesn't neccessary have to work exactly like there here, but I believe the idea (town who must join mafia in order to win) was the same.
You might be right. He could have been an offset to Rob's role. I'm getting the impression he just got bored and wanted out though, so he voted for himself, otherwise I can't understand his tactic.