Bad-ass host dad

My host dad is pretty bad-ass. We really struggled in the beginning of me living here, but now we get along... most of the time (even if we butt heads sometimes). Something I really admire about him is that he is, in my opinion, the most respected teacher of the entire school (even more respected than the principal). He has absolutely no problems with classroom management and students don't talk back to him. Ever. Students may not always do their homework themselves, but they sure do copy it so they do not arrive at the lesson without their homework because he is not afraid to give them a low grade. They are really afraid of him (in a respectful sort of way) and I highly respect that about him. But I often wonder what my opinion would be of him if I wasn't living here, although I don't even need to think about it because I am happy the way it is. So today I decided to take advantage of the fact that he his not only the most respected (and feared) teaching in the school, but he is also my host dad and teaches next to me. I am covering the classes of my partner teacher because she is really sick and the last lesson of the day was with 11th grade- following 3rd grade- each of which I said I never want to teach again... just my luck. The 3rd grade behaved for the most part, except for a couple of students (girls??!!) who I had stay after so I could speak with them about doing their classwork when I ask them to and listening to me and not getting up out of their seats. As I was doing this two 11th grade boys walked in and when I asked them to leave, they talked back to me and they wouldn't leave. Then they started playing music. They were absolutely terrible and it was not helping matters when I was trying to teach the girls about respect. Finally I sent the girls out and then went to my host dad, who told me to send the boys to him. When I told them that, they wouldn't go. At all. He heard my frustration with them and came out into the hall to scold them. Then as he was walking away he said, "if they act up in class, know that I'll be right here." Needless to say, the lesson (although it was only the 2 boys and 3 girls who speak English very well) went much smoother than usual and the boys behaved... for the most part. Maybe I should start threatening them with the wrath of my host dad more often. It seems to work like magic.