Incident from Sydney, Australia.
The footage shows a 28-year-old woman holding down a 13-year-old boy, waving a knife around and yelling “I’m going to kill someone” and repeatedly declaring she is an “ice addict”.
Police officers approached the woman from the front, while one officer came in from behind her to pull her off the teen, dragging her away before three other officers hold her to the ground.
The woman can be heard screaming while the officers detain her.
The boy then escaped and was not physically injured during the incident.
The robbers started this with an advantage of initiative, numbers, preparation and mental preparedness. This is why the ambush is the most effective form of attack. If the shop owner were to react at this time, he would lose the majority of the time.
This shop owner feigns submission, waiting until the robbers are no longer focused on him and draws to fire when they are at their most vulnerable. This is a counter-ambush.
Mugging victim feigns compliance by raising his left palm to the mugger, parries the gun away with the same hand while concealing the draw of his own gun with his right hand and shoots the mugger, all within a couple of seconds.
Gunman pins the cop behind a pillar with fire to the left side while circling right to flank and shoot the cop in the back.
When more police arrive he recognises the need to disengage and look for a better position. Unfortunately his tactics and skills were excellent.
Wikipedia article on the 2016 shooting of Dallas police officers
Victim perfectly distracts mugger by dropping wallet, hiding his draw by stepping around another person and drawing from the hidden side without making any sudden or aggressive movements to indicate that he may put up a fight.