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.
The police officer holding the leg of the suspect has been derided many times on the internet. And it does look somewhat comical the way he is dragged around by the suspect.
However, his actions are effective in preventing the suspect from escaping. It is the other officer who should then be taking advantage of this by clinching with the suspect to take him down. Instead, he attempts to use his baton to effect pain compliance which fails. He only continues to use the baton which makes them both look foolish.
This is yet another example of why police need at least fundamental grappling skills, and their training is often not up to the task.
Police in this video clear a house room by room with a mix of best practice and sloppier methods (in particular brazenly opening doors and sticking their head or guns in) before they are confronted with a man who attacks with a knife. Luckily, in the last room they did not approach the closet door immediately and open it, allowing enough of a reactionary gap to avoid being stabbed.
Footage from both officers and a bystander are included in this video.
Video illustrates how quickly police interactions can become violent as people who intent to attack will hide their intentions, then attack with the least warning possible. Also, the police officer who was shot remained operational throughout the incident – another example of how a single gunshot does not necessarily incapacitate. It was also difficult to avoid shooting in the direction of the officer’s partner as the threat was still active and his partner was moving toward the closest cover.