That lying lunatic almost blew Smoak's head off too after he'd finished with the dog's. It's clear on the tape that he turns to cover the Smoaks again but doesn't advance (like you claim he did with the dog). In fact he stands perfectly still, and doesn't move an inch for the rest of the tape. Had he shot at Mr. Smoak from his position he would have also hit both the of the cops holding Smoak. So, no, he didn't "almost blow Smoak's head off too".
Hall doesn't move an inch??! That's Utter BS. Hall's back is to the camera for a second after he shoots the dog . Mr. Smoak is on the ground yelling and trying to get up. Hall starts *striding* toward Smoak with his shotgun leveled. The THP officer who grabbed Smoak more than likely saved Smoak's life.