This is exactly what officers should be trained to do when they pull their gun. It is what everyone should understand a gun is for: killing. Not deterrence. Not disabling. Not disarming. Killing. That is what guns are for, and it is what everyone who points one at another human being must be assumed ready to do.
It is also why ‘pull their gun’ is the ABSOLUTE LAST THING they should ever opt for. As the senior Wallace asked, why didn’t they use their tasers?
Jesus H. Christ. Non-lethal options (not that tasers can’t kill) shouldn’t be the shit cops lose because of budget cuts. Lose the fucking guns, first. Hell, I’ll bet you Philly’s PD still has plenty of military-grade hardware they almost never need, laying around. Probably bought more of it with the budget they didn’t have room in for tasers, too.