Look for the "lady in pink jacket" viewpoint if you want to see what happened with more clarity.

 Pretty textbook over stimulus reaction in my opinion.  This is reminiscent of the CA subway shooting where the intended taser shot was with a lethal weapon in my opinion.

 This type of training is hard, in my opinion.  In my opinion there is definitely a lack of proper education, probably, in my opinion, due to shortened or rushed training cycles.  This is an opinion.