Ever been involved in a work situation where conflict escalated out of control? Probably. How did the people involved in this scenario diffuse the drama? Were they calm, clear-headed, optimistic, and mutually respectful?
Those are good examples of people who respond well under crisis. The other example is someone who has a bad reaction, throws a temper tantrum, and goes on the warpath of blaming and finger-pointing. This is clearly a toxic person that could easily set people off and ruin team morale.