I'm guessing he's pushing her out the window only to catch her at the last moment. Only to say something to the effect "Next time the guy who takes you home might not be so nice", or "Do you want to fall or get back up". That or its on the first floor, lets her fall, and says the same thing. The whole thing being an exercise to help her stop being so reckless/whatever you want to call it.
I'd be surprised if its a genuine assault.
Edit: Also what happened to his eyes in panels 6 and 7? Are they closed or something, and if so why? His eyebrows have also gone into hiding.