Atop the train, Albus and Scorpius bump into the Trolley Witch.
She's not just offering Chocolate Frogs and Cauldron Cakes.
She tells them that she's been doing the job for 190 years (doesn't she need a vacation?) and her secret responsibility is to keep kids from getting off the train.
Her hands turn into sharp spikes.
Um, if she kills them, does that count as them not getting off the train?
To avoid getting spiked, Albus and Scorpius jump off the train.