Ben really never had a plan when he did his thing. Well that wasn't true. He felt drumming was a soul thing more than a talent thing. Again not true. It took talent to do what he did. However he needed to show how he felt while doing it. Why he did this was far more simple. He wanted to feel it in his body. That and the whole rebelling against the system. He was a part of it. 

He knew the gig was ending soon. He also knew he had to do something special. What ever. He did notice something. Some girl walking to the front of the audience. Odd. He had never seen her here. He found that odd but kept on knocking out the beats. With style of course.