Simple solution. Just keep firing. It will be a strobe light effect, and you'll be able to see ok.
Ok, maybe I need a little
I was taught to close the firing eye as I was squeezing off the shot. I've only fired rifles and shotguns in the "dark". Handguns in lowlight. Handguns posed no problem. Rifle and shotguns would give me some problems until my eyes recovered so the eye closing trick seemed to work ok.
-Scott-