Correct.You’re assuming two things, the officer was administering a form of instant retribution and secondly being thumped around the head a few times doesn’t impact your ability to think clearly. You can’t possibly know his state of mind nor his motivations, no one can. As a firearms trained officer he is going to have has been trained to deal with volatile situations and will have been assessed. Only the officer in question knows the truth about his actions.
Concussion can have an impact on your emotional state.