Well for any door it can get past the rear and forward edge of the lower squeegee on the glass where it meets the door. However if this really was a rear door I think you are over estimating to amount of water and confused as to where it came from. 494s have no locks in either rear door and no lock in the passenger door. The only door with a door lock is the driver's door and it has a cover and is for emergency use only. So if this was back door are you saying the water came from door handle /lock on the inside? If so, in a heavy rain water can be trapped between the interior door gasket and the exterior door gasket at the top of the door. When you open the door the water trapped falls in the handle/ lock area.