[Nateman]

Can they explain why high energy protons bounce around randomly before hitting something? Wouldn't they bend in the magnetic fields in an arc?

[Sopater]

black holes fling high-energy protons into space, where they zigzag around at near light-speeds

I admit that I'm a bit simple minded when it comes to this stuff, but wouldn't this "high-energy proton" need to be traveling beyond the escape velocity of the black hole in order to even be flung, and isn't a black hole, by definition, so massive that it's escape velocity is greater than the speed of light?