`` immy did n't stop even when reg came bursting in -- just kept shooting into the typewriter as if he knew it was his last chance , and since then i have wondered if perhaps reg was n't right about they , too -- only maybe they just sort of float around , and every now and then they dive into a person 's head like someone doing a double-gainer into a swimming pool and they get that somebody to do the dirty work and then check out again , and the guy they were in says , `` huh ?