As the train began moving, Ström heard a strange hissing sound. Maybe a window had been left open....?

Nope snake. "Thanks." Because he'd heard it, but not seen it. Not that not seeing seemed to have mattered much, since it seemed to be sitting there. Just sitting there. Not even trying to come after them. Interesting.

Oh, there was a riddle? He scanned it quickly and then read it again. "Has to be refering to something that happened during the Harry Potter era..... maybe during the second wizarding war?" That's what it seemed to be, anyway. With the boy-who-lived stuff.