I don't know, never been attacked by a super predator, never considered it either. Boars and jackals don't really warrant defensive measures, since they just want to be left alone. I carry a knife in case they're having a bad day, but plan to use rocks as my primary weapon.
My plan for
bear attacks is to basically "run" or "die", as fast as possible in both cases. I guess some sort of a stink-based weapon could work as both effective and public-safe defense.
See my earlier posts about aerosol spray cans and an ignition source. If you need to use fire as a defesne, a poor man's flamethrower would be more effective and a lot quicker to deploy IMHO. Also a lot less likely to be viewed as any sort of risk by some would-be company rep.
Um, wouldn't that harm both the attacker and attacked equally if used for defending a third party?
Come to think of it, wouldn't a flare have the exact same effect???