It´s a secret known to very few among the team members (and hopefully to no one else) that Bloodhorn´s role is quite a special one in the team. For a Minotaur, that is.
The truth is: No one has any control about Bloodhorn. He is alway led onto the field tied and blindfolded (by two other minotaurs who are actually much smarter - even to smart to play Blood Bowl) and then set loose..
The only reason for the fact that he injures much more players from the opposing team than from his own is that THEY try to guard or even block him.