I completely understand the single cop with a pistol, when he recognized a semi-auto rifle with dozens of rounds fired, knowing he was outmatched.
But FOUR of them?
I have issue with that. Four had a plausible chance to take him out, coming from different approaches and angles.
The ONE cop would have been a suicide mission with near zero chance.
You are correct in a typical outdoor battle situation where combatants are separated by hundreds of feet and have body armor. But in close quarters against a most likely untrained shooter a trained pistol operator, with body armor, should not be "outmatched".
He wasn't outmatched. If it were a military-trained individual, he would have been outmatched. All he had to do was engage the kid and the kid would have lost his nerve when he first received any return fire. I know teenagers. I promise I do.