[neutralino]

Welcome to ToeQuest, maxolliver, I hope you enjoy your time here, and find answers to some of the things that are puzzling you!

With respect to Hawking Radiation; the short answer is that the negative energy particle has to fall inside the event horizon because, if it didn't, it would be outside, and thus in the universe. However, negative energy particles aren't real, and so can only last for a finite time due to the uncertainty principle. So, if separated, the particle outside the hole must be the positive energy particle. Here's a nice explanation of Hawking Radiation-- I hope it's not aimed over your head! http://www.physics.ucdavis.edu/Text/Carlip.html#Hawkrad