ONE squeeze on your leg should have been "enough". (If done AT ALL, which is something I'm struggling with, because I would not accept that from my fiance--but we have a different dynamic than you and Knight, or anyone else for that matter).
That he did it over and over again, as you were trying to fling his hands off you is over the line. I can't see how this was being playful. If he can't abide noise during a movie, then how can he abide movement like that--isn't that also a distraction from the movie?
I'm sorry it took you back to that scary place. I am happy that you and Knight have been able to talk about it, and are working through it.