Jalil, David, Christopher, and April have definitely made some mistakes since they've been trapped in Everworld. You have to admit, it's got to be pretty tough not to screw up when you find yourself in a place that makes absolutely no sense. So, it's prtty understandable that Jalil and the others wouldn't think twice about trading a chemistry book for an unbelievably sharp knife, for protection. After all, the Coo-Hatch seemed harmless enough, just another group of transplanted aliens who managed to end up in Everworld. Now it seems those same aliens are combining the textbook information with their own technology to create horriFIC new weapons, and guess who the plan to use them on.