First of all, good on you for having the presence of mind to detect this problem before it got a LOT worse.
Ammo issues aside, and not to pick on this poor guy, BUT
If his rifle had an included, in-the-buttstock cleaning kit, like the M1A, M1, or standard-stocked AR, he could have tapped the bullet out and gone on shooting with the FAL.
Just with different ammo
.
This sort of thing is annoying on the range, but imagine if the situation was more "serious"...
Moral:
Every Battle Rifle and every Battle Carbine should always have an attached, dedicated cleaning kit, with rod and oft-used special tools. If your weapon doesn't have room in the buttstock, then fabricate some kind of pouch/container, and attach it to the rearmost end of the sling.
You never know when you might need it. Maybe real bad...