How does Oskar Schell fare in his first jujitsu class?

In What The? Oskar Schell's mother enrolls him in a jujitsu class to get him out of the house and exercise out his anger and frustration. The Sensei begins the class by ordering Oskar to kick him in the crotch in order to teach the children about body discipline. Oskar refuses on the grounds that he is a pacifist. He never goes back to the jujitsu class.