[Yes, well, that's enough to push him over the edge. He's not about to kill the guy but he also isn't about to let him just traipse around collecting whatever he damn well pleases - not without someone knowing what's up or wanting their memories messed with]
[So he's drawing out his gun - not to shoot him, but to walk up behind him and attempt to slam it hard against the base of his skull, just enough to knock him out or at least disorient him enough to get him away from these damn orbs and feathers]