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Here's another thought. We have so many suspected Mafia members, some of whom have been recruited, that it's overwhelming. Let's say we get lucky, and the Mafia members kill each other, and we finish off the remaining ones. But we still need to do something about the serial killer, about whom we still have no information. The Haven's ultimate ability won't kill him if he uses the "date" ability; it might only injure him. But the Zombies' ultimate ability could quickly and easily get rid of the serial killer. However, the chance that they will hit the serial killer is quite small.