I think what some people don't (or won't) see is there is a vast difference between what all our emergency services are told to do and what we as the public expect them to do.
They are all told again and again not to put themselves at risk, even to save someone. So they don't jump into a...
This.
He didn't have to go in all king-fu or all-in-wrestler, all he had to do was make a difference... give the assailant an alternative target, distract him, make him hesitate... that may well have been enough to save the other officer's life. All he had to do was get out the car and shout...