A leader is someone who possesses traits such as honesty, the ability to look forward, competency, inspiration and intelligence. These traits will show others that he/she is a good leader.
A leader manages crisis by calming down and prevent himself/herself from getting frustrated and thinking for himself/herself. He/She would also be optimistic and try to evaluate on what he/she can do. After doing so, he/she would have a better idea on how to handle the situation and with that knowledge, he/she would be able to avoid the crisis.