This is stupid though ‘cuz she’s headed for the door. He’s going further into the elevator. Even if the door isn’t open, there’s still a bit of a ledge near the door that you could stand on while bracing yourself against the railing. Once the door opens, you’d be in a good spot to exit via the door as well. What she’s going for is smarter than what he’s doing.
Also she clings to the rail, he throws his hands up. If he were to fall, he’d have nothing to hang on to, she’d at least be able to hold herself up by the rail
Also, solid ground? It’s clearly falling out from under him. There is no solid ground. What he was just standing on fell. What makes him think that what he’s stepping onto (the exact same thing that fell) is any stabler?