A Wizard in my group likes to use Hypnotic Pattern. It's quite overpowered in its own right, but the way he made it sound is as follows:
Targets that fail are incapacitated and can't move, attack, or react. So he has the group circle them one at a time, where the entire party gets advantage attack for one round.
I didn't think to question this, but looking deeper, shouldn't it be just a straight attack and after the person is hit, back to regular initiative?