The Judgment Call

Student teacher Al had the unique experience of working with Mr. P, a grade 8 teacher who had volunteered to take the misbehaving boys in the other grade 8 classes and teaching them all together in his class. His style was democratic and project-based, which seemed to work well with these boys. 
One day Mr. P was away. It was Al's first experience managing the class on his own on his first practicum. A supply teacher came in and the instructions were for Al to do the teaching. The supply teacher would be there for support and of course, for legal purposes as Al was not yet a certified teacher. 
When Al brought the class to the music room to be taught by the regular itinerant music teacher, the boys did not all respond very well. The music teacher Mr. Z's style was more regimented. They typically acted up more in music class because of this. One boy beat the drum while Mr. Z was giving instructions. This prompted a swift "Go to the office!" from Mr. Z and the firm request: "Mr. T (Al), please escort this student to the office! He needs to see the principal for being so rude!" 
Al went into the hall with Jamal. The supply teacher remained in the music room. He made a judgment call. He whispered "I'm not going to take you to the office. Let's go for a short walk and come back to the classroom. I saw what happened. I won't tell Mr. Z. okay?" 
Upon Mr. P's return the next day, Al told him what had happened and how he had handled the situation....
What should Mr. P say to Al?