Ok.  I watched that clip.

How come when they left, they did not take the briefcase with them?

Am I missing something?  By the way, I had never seen the whole movie, so surely I must be missing something about the meaning of that briefcase.

Also, why was the one cowering black kid spared?  Travolta's character goes up to him in the end of the clip, and he asked why they were not told about the guy with the BIG gun who was hiding in the bathroom, and the kid does not answer - yet he was spared.