Yeah, looks really bad, and you could tell from the players' reaction that it was a really scary moment. Hoping for the best, heard a rumor from a friend of a friend who works at the hospital that he's currently intubated, which I suppose under the circumstances is the best possible news to hear. I also saw some people say the ambulance left the stadium with sirens, which again is as good a sign as any absent other details (since no sirens would mean he was pronounced dead I think).
Hoping for the best.