I have fired with two pirate crew reenactment groups, shot at three different 'pay to shoot' ranges and fired at three different Rendezvous: I have never heard of flash shields being "required"."Never been to a range the required flash shields...?
"My club doesn't require flash shields, so don't go saying that all ranges require them"
Most ranges require a flint lock shield if shooting a flintlock.
I did not say all ranges require them, see above. The three (3) ranges that I shoot at require them. It is a safety requirement along with safety glasses and hearing protection.
As far as being hurt by the flash; we cover safety strictly where I have shot, as far as public ranges go it is the Shooter's responsibility to Not pull the trigger if someone is off their right.
As far as "it hurts"; yes I know, one fellow once came up on my left, reached over my shoulder with his pistol and fired! Burned the heck out of my face - he got some strong words from me and the group leader took away his shooting privileges for the rest of the event.
Again, why I don't bother with crowded ranges these days.