The results of the MRI on Donald Buckram's knee won't be known until Thursday morning, but undoubtedly some will be casting blame long before that.
They shouldn't. This was just a fluke happenstance, something that occasionally happens even in a non-tackling drill. The drill Buckram was participating in was the type of work any tailback needs to go through to get ready to play a game, the type of drill every player in America does many times on a typical Wednesday practice.
Throughout the fall every reasonable precaution was taken to protect the team's most valuable asset. Sometimes even that isn't enough.