The hip-hop teachers dance their way to the sound system, singing the lyrics and playfully marking sounds in the music, stretching their dance as needed to hit the phrase endings before killing the music between exercises.
Observing teachers a few years, I've noticed the more the instructors know and respect the music, the less likely they are to stop it until a phrase ends. The better ones are consistent with this behavior.
They are listening to the music, they respect the music and they don't want to interrupt until a logical break point. You'd think they were in a live conversion, being polite and waiting for an appropriate opening rather than interrupt their friend.
People who love music find it almost rude for someone to stop the music in the middle of a phrase. When I see them waiting for a good stopping point, I simply smile and note that these teachers are in tune with the music, and that's a great sign for their students.
Let me know if this behavior is happening in your scene.
No one will ever win the battle of the sexes;
there's too much fraternizing with the enemy.
-- Henry Kissinger