In the very beginning of the crucible what could have been done to stop the tragedy from happening ?

As a couch, you need to know your tactics of teaching. You need to teach the team how to dribble the ball first and then teach them not to keep to ball in their hands or they will do a mistake called traveling. You can hold the hall in your hand for few seconds but you can hold on to it. You have to dribble the ball and pass to your teammates