The triwizard tournament wasn't the only time Harry had come in contact with anti-gravity mist, and he was quite sure Al didn't know what he was talking about. From his own experience it wasn't at all pleasant, but rather the opposite.
Though instead of arguing his point, he nodded. "Trying it first would likely be a good option, see if it's a way you'd want to go before deciding on anything."
"You know an alternative might be to have anti-gravity mist as a security feature when entering the house. Any unwanted visitor would end up hanging upside down and not be able to reach the stairs and the doors. It would give you time to escape."
"Just an option," he added, and really, this was getting ridiculous.