just as you should not know how to fly a plane without knowing how to land it, you should not fly a sub without knowing how to land her...
It is the Dom/mes responsibility to care for his/her submissive before, during and after play time. Even if the submissive can move after play, sometimes it just feels right getting a washcloth, wetting it, then washing her a bit afterwards. The submissive has just given you so much of herself, a kind deed of that nature can draw you even closer together.
I wish FROZENGRAPES would have named this person, if for no other reason to warn unsuspecting submissives.