It is an exploit, but so is hiding in a corner waiting for someone to walk by. You are using the environment for your advantage, and they were using a game design to their advantage. Both are perfectly fine strategies to do, but leave you vulnerable in other ways. If they were dancing, they are wide open to an assault. If you saw them go to dance, you should have rushed them with your shotgun. After all they were dancing. All I know is PVE and PVP my EXO body has to dance. My legs just cannot help themselves. Too bad I can't level up my poor dancing skills. A white kid must have programmed me.