It was one of those scariest moments that you never want to see in sports. Jaylen Brown has been an essential part of the Celtics lineup this season. Sitting at the number 2 spot in the East right now, he has helped this Celtics team by averaging 14 points and 5 rebounds per game. But that was all in danger of coming to an end after this scary fall following a breakaway dunk left Brown landing directly on his head.