Zambi: If the mafia has, as you said, sniper, or a poisoner, or there is a vig who decides he wants to try his luck, or is dick cheney and has to shoot, ect.

Trig: (If you were scum) Going with his statement would have been a gambit. Moreso if there is a mafia member on your train. As for the role, read what I quoted from the sign up page. If you're town, unless you have a way to survive the night, it still looks MyLo to me.