FWIW, the rotated shoulder is a pretty common aggressive move for people screening or impeding players cutting through the paint. Mariya put way too much ooomph into it to get away with it, and I suspect that's what Walz thought was stupid when the idea is just to clog the cutting lanes. This particular shot was so effective because the BYU player was running through the forest with her head lowered...something she'll learn to think twice about in future. I'm willing to give Mariya the benefit of the doubt that she didn't target the jaw, and that's where I draw a distinction between a punch and even a well-placed forearm, that invariably target something. Given the damage done, a few forearms thrown in response should settle the issue.