Normally, from my understanding of these sorts of accidents, you wouldn't fail to move your foot over if you're only braking gently but you might if you need to

Normally, from my understanding of these sorts of accidents, you wouldn't fail to move your foot over if you're only braking gently but you might if you need to slam down the brake. As your reflexes slow down as you age you'll find yourself getting into more situations where you need to slam the brake. And it will more often make sense to apply a hard brake now because you know you won't be able to increase the braking force in time later if it becomes necessary. I don't remember the last time I had to slam the brakes in my own driving but when I'm riding with my father he has to do it pretty regularly.