gordo, I sure hope it never happens to me. I did Louis' class this summer, he has a couple more diabolical refinements added to the 'hostage shot' now that I hadn't heard of previously. It really calls for threading the needle, and doing it fast and under pressure.
My eyes not being what they used to be, I prefer ghost rings on a dedicated defensive shotgun. I started working out with a bead sighted barrel before I took the class in May, planning to use that gun (the 1976 Wingmaster magnum I found earlier this year) in the class. I just couldn't get slugs to group with it the way i needed them to at 50 yards, my fault and not the gun or the ammo. With GRs I could pretty much keep the holes touching at 50 yards.
Choice of sights on a shotgun is one of those things that's really up to the individual shooter to determine. Every shooter's needs will vary, some can do fine with a bead (or even without one, I have seen a good many shotguns that were missing beads that didn't seem to bother the shooter at all). Others need more as far as sights go. For a mutipurpose gun that will be used with different barrels for different purposes, either a bead or rifle type open sights on the barrel are the best bet. For a dedicated defensive gun, all options are open. KISS is still the best bet IMO, whatever is the simplest system the shooter can get by with. I shoot essentially the same style aperture sights on both carbine and shotgun.
lpl/nc