I’ve done it many times when I was in the biz.
Sometimes 10 times in a day. And with way more than 500 lumens sometimes.
Your vision will show a burnt circle that will go away slowly, but surely.
I still have 20/30 vision at 69.
It’s instinct.

I was testing a 44 magnun once, and had a misfire.
Then I turned the gun to my face and started pulling the trigger.
My cousin saved my life. The next round was very much alive.

Cheers.