Exactly my point, Zombie. You leave the immediate area of an armed encounter, if possible, for the same reason you don't sit in the middle of the interstate after being involved in an accident. So you don't get hit again.
I've got near 30 years behind a badge and I would not consider such a defensive repositioning anything but common sense.
“Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals. It can only be ensured by instinct, sharpened by thought practicing the stroke so often that at the crisis it is as natural as a reflex.” ~ T. E. Lawrence