I’ve never done this to anyone, but have been the recipient. Unless I know the teacher and their understanding of the body, I almost never let anyone touch me. Especially if I am trying to slip away for a few minutes. 

What are your thoughts on passive stretching in twists? For example, Parivrtta Sukhasana, it’s often taught to use the hand on the opposite knee to pull yourself further into the twist. However, after assisting at a YTT, I’ve come to believe that a simple action like that can lead to injury.