I'm a worrier about things like these. I always imagined that's why the roof in the bathroom is lower and curved. A lot less room for gaining vertical speed. So you'd be temporarily stuck to the ceiling and perhaps a bit dirtied, but less hurt than getting double struck by first the lockers and then the higher ceiling in the aisle.
They should install a gravity switch. A simply contact that uses gravity to either remain normally-open or normally-closed, and then when the opposite is true, automatically flush.