I think I'm looking too closely at this detail

I could be overreacting, but has anyone noticed that in Escape from the Pizzaplex Novel, only Cassie is being chased by the reagent, because it wants to "decontaminate" any organic matter (i.e., humans)? But Gregory is running around the pizzaplex, safe and sound? Ofc Gregory could be hiding in Freddy, but he has to come out, right?