I think most of us can only imagine how difficult it is to be in that position, the fear, the panic, the training kicking in. It seems pretty plausable to me.
I can imagine that anger does play a part at times. These guys are taken at 16-18 years old, taken into hardcore training and convinced that they are the best of the best, taught to fight and trained to take on the enemy. They are essentially brainwashed, and this is necessary to make them the good soliders that they are.
Situations like this are bound to happen.
