The headmaster thoroughly enjoyed the dramatics and left the kids to it. As long as no one got hurt, it was all in good fun. He took a few more dives off the diving board, finished up with some cool down laps and then made his way back through the crowd to his towel draped over the railing. It was soaking wet now from all the splashing, but he was the headmaster of Hogwarts and wasn't about to let a soggy towel stump him. It was dry in a jiffy. Once he patted himself down he draped the towel across his shoulders and gathered his shoes and robe, then performed the sonorous spell to make an announcement.
"Everybody out! It's thirty minutes to curfew!" he pointed out and then performed the counterspell.
He waited for a long time for all the students to finally trickle out of the water and back to their common rooms. He probably should have given them more time to get back in time for curfew, but they managed. Before leaving, Headmaster Bontecou cast some spells to be sure all the students made it out of the water and to return the castle and water to their former states: diving board-less and wicked cold. With a grin, he turned on his bare heel and started wandering the halls to look for his office.
ooc: Unfortunately, all things must come to an end. Thanks for playing and I hope you had a great time.