Just as they are about to exit the roof, Mainwaring, Hodges and their men are trapped in a thunderstorm by a falling ladder, leading Mainwaring to ask Wilson if "the Fire Brigade wouldn't mind popping round".
As they are about to leave the roof, Mainwaring, Hodges, and their men become trapped in a thunderstorm by a falling ladder, prompting Mainwaring to inquire if "the Fire Brigade would be willing to stop by".