That's called reaction, and even the best training doesn't avoid it (because it can't, it's how we're wired). Training ingrains in you how to act when you have to act before you can fully process and think. That's oversimplifying things, by quite a lot, but it covers the basics. That has nothing to do with being trigger happy. Either you're wrong or you used a phrase you don't fully understand.
That's called reaction, and even the best training doesn't avoid it (because it can't, it's how we're wired). Training ingrains in you how to act when you have to act before you can fully process and think. That's oversimplifying things, by quite a lot, but it covers the basics. That has nothing to do with being trigger happy. Either you're wrong or you used a phrase you don't fully understand.
I think they are trained to shoot right away if suspect makes wird hand movements
you could see it on the video how they all shot in unison according to training