Intent, opportunity, capability. This veteran has lived the Rules of Engagement and did the right thing. Especially since he was on camera...now if the perp raised his gun once he was out of arm reach from having his arm pinned to his side, all bets are off. He did the right thing and didn’t serve a minute in jail.
With his gun trained on the perp, he could easily have gotten off a shot before the perp got his fully up and aimed. He might’ve gained by taking a two-hand stance.... But hey... Its easy to be an armchair gun coach. :-)