Currently in a situation in game which is a classic example of where this could be implemented.

Hag's Lair - masked servants fight: despite the fact there are obvious reasons not to want to slaughter these people, various alternative solutions aren't available. Whether through stealth and pickpocketing (currently their inventory is empty until downed), or through a grapple action in combat, we should be able to remove these masks to set the people free. Even if I use the knockout finisher on the opponent, and remove the mask from their inventory, they remain under the spell.