I've seen the video where all these methods were tried to no avail, so I don't have much faith in them. The safest solution is to put the animal down, but of course you have to have something on hand to do that. A 4x2 to the temple should do it. That'll end the aggressor and save the victim.

"Should", maybe, but I've seen a pretty disturbing video where a pit bull took a lot more than one hit... it was multiple minutes of hits. And it only let go after it died, I've never seen anything like it.

Do you know where I can find that video?