For the Long Sword "Fire Biter" (cmswq10), the fire damage effect is on the weapon itself, rather than on its melee ability, and it's set to self rather than preset target. This causes the fire damage to be dealt to whoever's holding the weapon (just once)!
Edit: Also, why do so many Section operatives have Druid's Rings? (cmsec14.cre, cmsec19.cre)
Edit: Cmboot01.itm is setting AC to 1 rather than incrementing it.