JESUS CHRIST! Who the fuck cares what "reason" Buddy had to violently attack his master for picking up his leash on the floor? Very little brain activity there other than the short-circuit that's in all Pits due to over-breeding. With Shepherds and Golden Retrievers it's hip-displacia. With Pits it's sudden violent attacks. And with the power, speed, and athleticism they have, that attack often turns fatal because they do not stop.
In my opinion, the reason is important, because of the flawed notion that all pit bulls are bad. It may be that Buddy, like other pit bulls, was abused when young. That may not be the case for Buddy, but it is the case for many pit bulls that attack. If a pit bull is raised lovingly while young, I see no reason for that sort of dog to just suddenly snap for no reason. The dogs are actually quite intelligent, depending on the kind of pit bull. As for the short-circuit you mention, do you have biological evidence of it? When those certain pit bulls attack, it's because they were abused and trained to not stop. They're violently trained to be tough, aggressive, destructive guards. A friend of the family bought a pit bull "trained" that way, and while working in down-town Milwaukee he'd leash the dog to his work van with a long chain, because thieves were known to burglarize those vans in a very short period of time.
I'm curious to know if there's a study regarding pit bulls that were raised with love and attention, since being puppies.