He'd remove the lid of the toilet exposing the refill tubes, take the hose off the tube and use it as a bidet. Then he'd take the shower curtain and make an air tight seal over the toilet tank and poke a hole, he sits on the hole and makes a new air tight seal and starts flushing the toilet, this creates a slight vacuum effect causing the water on his man seal from the bidet to evaporate a bit faster than being exposed to the air. Then he stuffs the curtain into the toilet clogging it and breaks off the float in the tank, the room very slowly floods with water, right as he is about to run out of air he takes a deep breath and starts shoving on the door and with the water filling the room there is enough outward pressure for the door to fly open and both he and the bathroom attendant are able to escape.