Other than the two chop blocks, I did not see any signs of dirty play. They were not hitting late, and they were not continuing the action after the play was dead. They did go low many times in the game, but every small player does this when faced with a much bigger player - even in the NFL.
The Cam Robinson injury was an accident - a player rolled on his ankle. The Cooper injury was an accident - normal tackle, low on a much bigger player. Fowler, Stewart and Vogler injuries were just football play injuries and not related to even low hits. Only A'Shawn's injury can be attributed to an illegal or dirty play.