Making Automobiles Great Again
You need GROSS motor skills on a combat weapon. You need to VERY EASILY get your hand in position without having to think about how to get it under the light. Practice and let us know how it goes.
One thing in particular that this showed me was just how difficult it is to quickly draw your pistol and rack the slide to chamber a round when your fine motor skills are toast due to stress. I wasn't a believer in that until I experienced it myself this way, and I now carry with a round in the chamber as a result. I didn't before.
Another thing that I do sometimes when I do this is to load several magazines with a different number of rounds each, usually only just a few rounds each, then practice rapid fire and multiple quick mag changes. These are things everyone should work on, rather than just assume they'll somehow be fine under stress.