Is there a good reason why this player keeps manually taking off Stone Skin?

[Chocolys]

Don't want stoneskin? Alright. You got it. One less person to stoneskin in the group.

I say give'em what they want.

Indeed, and I would stop casting personal heal on him too. If he purposely makes his HP weaker , I will not bother restoring them.

The only thing that makes sense to remove, is a too early casted or still remaining Regen buff, if the tank is not comfortable aggro-wise about starting a new fight with Regen already on.