It has to do with how the game loads sections of the level from the CD. I originally had it coded and tested with Maria, and the main call hook as still there for Richter, but the receiving end of the hook wasn't there on Richter's section. So the game just crashed. And since Richter's SAT sheets are bigger than Maria's, I couldn't just replicate the hook routine in the same spot/sector for his data/chunk. So I moved it somewhere else that has no tie to either of them. It's fixed now.