They had a lot of ground to cover with this spell, mostly the seventh floor because Alexa had no plans to be forced to climb all the way back up but even then, the 7th floor was wide and had a lot of places to be insulated. Why no one set them to this task earlier she wouldn't question but it seemed like common sense to do it back in January, not all the way down in May. Most of them could have DIED from the frost by now if they weren't such troopers.

"Your Common Room should be properly insulated already but while we're here," Her coming to get him and all, "might as well put the spell to use on the outside corridor." One less place to insulate when they got further down the corridor.

"Hope you haven't forgotten the spell in the space of a week." She said, raising a brow and giving him a look but just in case she drew the horizontal eight in his full sight. "Caelum Saepio." All along the walls. Did he see? There was the slight fog rising too. "Remember, if you see no fog, it didn't work."

This time she cast closer to the entrance, so the cold wouldn't seep in and all "Caelum Saepio." No doubt he'd been working too and after she felt she'd done enough casting she continued down the corridor. Come along Dima.