I'm pretty sure none of us know how Tibby handles stress and confrontation or whether he feels up to out-running/out-fighting a stranger or whether he had a clue of the consequences of getting a can of raid in the face. And we know even less about the RAID-robber but sure, let's prejudge and second guess everything he did in a situation that ended with no one getting hurt and the robber walking away with just a bricked iPhone.