I wasn't stopped like how @leonard_x had said. I taught dry land exercise for swimming. My sequences of teaching were:
1) Introduce myself and what they are going to learn today.
2) Set ground rules eg. when I talk you don't talk. follow my instructions. safety etc.
3) Show them some youtube of what I'm going to teach eg. freestyle, to let them have some ideas because I think it works very well for kids.
4) Then start teaching.
So when the interviewer tried to be "naughty", I reminded them of the rules that I set. That's how I got through the teaching part. I think there wasn't any chance for them to be too rowdy I guess?
Hope it helps!