De acordo com a novela júnior do filme, foi porque Rey não colocou a placa do convés recuar corretamente:
Her current operators weren’t hard to find. A deck plate in the lounge wasn’t flush with the floor. Chewbacca tore it free and Han pointed his blaster at two youths—a male and female, both human—and a newfangled round-modeled droid. The youths raised their hands in surrender.
Na verdade, vemos isso no filme, embora não seja especialmente óbvio: