"Don't be an idiot and go out there," Zelgadis said. "You've never been in a void storm before." And Zelgadis had. Once. On the train. "Do you hear what sounds like voices singing? People hallucinate from void exposure, and being out in the open is worse." Granted, the last time the train passed through the storm, the hallucinations were mostly visual.

Zelgadis is going to tell himself it's entirely about keeping Rezo stable enough that he's not a hazard. That and he doesn't want to owe Rezo anything. if Rezo decides to leave anyway, well, Zelgadis tried.