That wouldn't work though. Remember when Banner tried to kill himself? It didn't work, so I doubt them trying to kill him would work. It would just make things worse for themselves.
Maybe with a sneak attack straight to the head. The reason why he couldn't commit suicide is because he was expecting danger and his instincts kicked in.
Tony Stark would so win... like, he'd just hide in an underground bunker he built with his bare hands and come out every once in a while like *psst... are they dead yet*
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