Forcing people into/out of Darkest Self?

I'm working on a fan-Skin for my new precious, M<3s, and I am wanting to give the Skin one move that can force someone out of their Darkest Skin and a different one that might force someone into their Darkest Self.

I originally approached this thinking that these moves was quite overpowering, allowing one player out of all of us (MC included) to exert that much narrative control.  Thus, I tried to exert some balance to that by handing out Conditions, harm, other penalties.

I've begun to wonder if I'm not overreacting, so I thought I'd ask ya'll for ya'll's opinions.  How powerful do you think these abilities would be?  What metric are you using for power in a story game?  What is the best way to balance a move if it does involve a high-power ability?

I'd have a hard time with a move that could force someone out of their darkest self--Darkest Selves are only interesting when you're allowed to stay in them for more than a few minutes, and the escape clauses say something about the character.  Any skin move you create should take quite a bit of time and/or have costs or consequences that reveal something about the characters.

I'm more okay with moves that cause someone to become their darkest selves--after all, the mortal has one.  But you might give it as one of a number of options, just like lash out physically, hex casting, and the death move do.

The issue about pulling someone out of their darkest self is that helping people is something grownups do.