Hayden was not old enough to be able to do magic on the trip (which she thought was very unfair by the way because she was perfectly capably and only one year away from the cut-off) but she paid attention to the spell anyway. Viseo Ebullio. She repeated it to herself under her breath a few times. The bubble head charm was a very useful thing to know, because it could be applicable in many circumstances. Counter-clockwise wand movement around the head. Hayden memorized it, even though she wouldn't get to use it for a while.

Gillyweed? She had heard of it but not extensively. So though she had an idea of what it did, she was not positive about all the details. She started to raise her hand. Did they have to do that? They weren't in school, though this was a school event. Hayden was very confused. She decided to just go over to Professor Thompson and pose her question directly to him. Very politely of course, and making sure she wasn't interrupting anything. "Professor, doesn't Gillyweed only work for a certain amount of time?" That was only the first question, she was prepared to ask the others as soon as she got an answer for the first one.