That is just.. bugged. Instead of restricted to body tissue or fluids.. it could be any possession relating to said target to trigger.. =.=
Just who is behind all this? Some bored gods? It sounds like a cause and effect level ability..?
yeah this has to be bluff theres no way that his abilities concept of "ownership" is that vague
its not his gun or ammunition
he picked it up and shot his shoulder in what dimension of brainfuckery would that bullet be considered as his
depending on how you define it a fucking rock that he threw would be his too
or some pebble that he kicked