Since the cane became my constant companion I'm not as sure on my feet as I was 20+ years ago. Moving and shooting is a recipe for ending up on intimate terms with the ground.
If that is going to happen, I want it to happen on my terms, NOT some thug that thought I'd be an easy paycheck.
To that end, I usually shoot OR move, but seldom at the same time.
Because of my personal circumstances, I practice drawing while falling. Not something to do with a loaded firearm until you are well practiced orienting on the threat on the way to the ground using a non-lethal option. Once you have controlled falling down, making accurate hits is a relatively easy progression.
The situation will dictate what response is appropriate, but if I haven't practiced a skill, I'm not very likely to employ it successfully.