1. They are trained very well to handle stressful situations calmly. 2. Knowing an incident just happened, they are probably aware of the fact that each of the

1. They are trained very well to handle stressful situations calmly. 2. Knowing an incident just happened, they are probably aware of the fact that each of their words is being recorded and will be examined during the investigation. Like "don't talk to the police if you are arrested" it's wise to say as little as possible (after the danger has passed)