That’s not terrible shooting for a cop under pressure. I don’t believe “no exit wounds”, not even with hollow points. The shots in the hand and the arms should have exits (unless they just grazed on their way to the head and torso).
Not if the arm was in line with the path of the bullet. That would be consistent with him having his arms at his sides, pumping them as he charged toward the officer. And totally inconsistent with standing with his arms over his head.