Except it appears there was an imminent threat.
Your minimum response is two rounds is a minimum.
Many instructors teach to keep on shooting until the threat is down and no longer a threat.
Any instructor who advocates shooting until the threat is down should be avoided. I would hate to defend that in court. You don’t shoot until he’s down. LEOs should be following department guidelines. No department I know of advocates emptying your magazine. In my department minimum response was two rounds to center mass, lower your weapon and make sure there were no other threats and that your target was neutralized, and then reengage if necessary. Too many officers these days don’t do what they were trained to do.