Seeing police in retreat, the crowd mistakes this for a lack of will to fight. Once a police officer falls and has their gun taken, his colleagues return and now have a justification for use of deadly force.
Holding a gun to someone at close range means things can get very complicated very quickly. Within arm’s reach usually isn’t a good range.
This man does not have many skills; but speed, distance management, movement and positioning allow him to use his right hand to great effect against men who possess even less skills than he does.
Pawn shop owner feigns compliance, moves to cover and counter-ambushes robbers.