At least my logic tells me, well things are not going to pop out along the direction of the accretion disk, because then they're going to be absorbed by other things in fact that's what's going to cause other things to get heated up closer to the actual event horizon, so any energy that's going out in that direction is just going to be absorbed and make other things hotter, and only when you go roughly perpendicular to the plane of the accretion disk is that energy aloud to kind of go transmit freely into space 