It's kind of hard to tell how the play unfolded from a few frames, but the MC went flying perpendicular to the side-line. Yes shoulder to shoulder contact is legal, but within reason. You cannot be "reckless" or use "excessive force." Whether a tackle is one of those is up to the referee. In...
This is one of my favorite series I've read to date. As a fantasy reader, you can't go wrong with this one.
Also I don't know if I'm allowed to say this, but skscans has translated up to chapter 158 as of right now.
Take it easy.