UMM i wouldnt stop hunting there. As far as what could rip off the face of a steer, that could be anything. Are you sure it was an animal, and wasnt the steer just getting stuck in an odd spot? If it was an animal, it could be anything from a loose dog to a Mountain Lion, you would have to investigate the bit further, a good way to do that is have the farmer call the local game officals and ask them to bring a biologist by the farm to take a look at the steer. But i wouldnt let it stop you from hunting, i have had grizzlies follow me around for two weeks straight in the back country hunting elk, it didnt stop me from hunting, was i scared? hell yes, but i just made sure i was always ready.