Menty, but how do you then "hang" or "kill" a resurrected person if they are supposedly not in the game?
Judging by the characters, I personally wouldn't see any difference between killing one or the other mafia member.
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By the way, Zuko did the same thing in the series. He didn't know for sure if Aang was alive, but he suspected that Katara might have healed him, so he sent a mercenary to capture him, just in case.