It's funny, and Stan Lai laughs like a playgoer caught up in the show. But the scene's not ready yet. The actors drink some water or take a few puffs on a cigarette, wait for their cue and try again, putting on the finishing touches. In the end, though, the scene is dropped.
還不成，演員抽抽煙、喝口水，聽提示，再試，琢磨出一段情節，不過正式上戲時又刪掉了。