VIDEO: Why it's essential to have eyes on BOTH hands
First, it's essential to have eyes on BOTH hands of a suspect.
Second, suspects DO go the gun even when facing the muzzle of an officer's pistol--they KNOW action beats reaction.
Third, it's awfully nice to have a second set of eyes and second muzzle on your side. If this had been a lone CCW'er making a "citizens arrest," for example, what do you think the outcome might have been?
Anyway, enjoy. The video clip runs twice, first straight through and the second time with some freeze and text annotation to highlight key points.