Hmmm. Ella was quite fascinated by the shield charm, mostly because it was extremely useful, especially in Defense Against the Dark Arts. Also, Ella had been talking about Shield Charms in History of Magic during the discussion about the Hogwarts Express. Speaking of that, Ella had a question. "Professor, we discussed the Hogwarts Express in History of Magic and I was wondering if the train used this particular charm to ensure that it could move back and forth safely through any type of weather." It would make sense, considering that Gambol had used all kinds of magic to prepare the train for transport.