Yeah, everything I've heard/read about aggressive dogs generally state a lot of information about avoidance/evasion. I think it's generally considered a dire situation if it comes down to a melee against a dog of generally any large breed. However, when you look at the security class of dogs, no matter what, it ain't going to be pretty.
But a pitbull?
Just...no.
Oh, and there is one aspect of dogs that also differs from humans quite a bit that hasn't been mentioned yet:
prey drive.
When you set off a dog's prey drive, it can be difficult to "talk them down," especially if you're the target.