"Unfortunately our school expert on Erde is among the missing," said Ms. Harcourt unhappily. "However, Agent H has been very forthcoming about conditions in her home reality. From what Hope has told us about her world, the Nazis are unlikely to have made an alliance with the Grue. Erde has been as much a target of the sternjuden, as the Nazis call them, as has Earth-Prime. But that doesn't tell us how this kind of technology was brought to bear on our own world." Estelle will remember Hope Rogers very well; she's one of the kids on the watchlist in chem lab. Apparently there was an abortive incident last year with some sort of improvised rocket and explosive. "I recognize some of this as the work of one of my students, one who's not quite as clever as he thinks he is..."