So I heard you could do it this way, I also heard it was most effective when the electricians have their hands in a high voltage panel, if say perhaps they pissed off the welders? You light torch and set for clean cutting, extinguish flame with your hand not adjusting valves. Point nozzle into big zip lock bag. When full, seal. Then put zip lock in paper grocery bag which then acts as fuse, allowing sapper to place said bag close to electricians. Light paper bag then casually walk away. By the time it goes you are nowhere near the event and I assure you there is no remains. The electricians will absolutely panic and after cleaning out their pants and ensuring none are hurt, they will spend hours looking for ground fault on high voltage. I have absolutely no idea if this works or not but I heard a guy talking about another guy who knew a guy, well you get the picture!