Diane, though she came following Anna, carrying over her shoulder her disproportioned-large backpack, she pretty much walked past the other two students and tried entering the room.

At which point she slammed against a transparent wall that pushed her back and made her fall on her bottom.

She hardly peeped, though. Sitting in the floor like a rug doll rubbing her now reddish nose, she looked pensive and with little intention of standing up or care to demonstrate pain. Interesting room, protected even though it had fell into disuse. Suddenly, wordlessly, she got up and walked away...

... and soon was back holding, what some of them would think was a drink bottle filled with murky water, yet others would realize was a bottle with water from the floods that she brought from the Potions Laboratory.

Again she was with the three people standing by the door, uncorking the bottle. "Stand aside, please," she instructed. Then, without other word, she emptied almost half the bottle against the translucent wall. This was Diane's idea of killing two birds with one stone - wonders if it will really corrode through the charm, she thought...