If your car is accelerating towards something out of control you are expected to have the presence of mind to take your foot off the accelerator before jamming on the brakes, this is really no different.
There is a difference: in a car, you use the same foot for the accelerator and the brakes, so if you brake, you have that foot not on the accelerator. While on the aircraft, braking doesn't cut the throttles.
I think the crew really didn't expect the aircraft to move, so the crew hadn't thougt what to do in case the aircraft would move. If you have to think first, you are too late..............