ten o'clock
`` You 've got quite a knack for this sort of thing , '' Mr. Bouncing observed . `` If you 'd been a clever man , you might have been a doctor . '' Mr. Bouncing did not knock during the night . Winn heard him stirring at ten o'clock , and went in . The final change had come very quickly . Mr. Bouncing was choking . He waved his hand as if the very appearance of Winn between him and the open balcony door kept away from him the air that he was vainly trying to breathe .