DB, being a big boy such as you are I'm sure he just thought your thumb looked like a milk bone. hahaha J/J of course but you are right about the taste for blood thing. And once they lock hold of something you have to pry their jaws open. Damn bro that had to suck. I had a female pit and she was sweet as a lamb. I just put her down last month and it almost tore my daughter and my heart out doing it. I believe it is how the dog is raised as to how it reacts to it's surroundings. Maybe these people raised theirs wrong.