Too may errors.
No FBI agent or even a beat cop would attempt to do some of this stuff on his/her own.
Far too much of this went on throughout the first series.
The same outcome could have been achieved with more realistic COP/FBI procedure.
Putting guns down, separation from a group when searching, turning your back etc, etc.
I hope the director and writer tidy this problem up before the next season, if there is one.