6 D-cell maglite, dry powder fire extinguisher, baseball bat, LARGE knife.
Those dry-powder fire jobs are bad news. When the powder gets wet, makes some kind of stuff that will etch the copper off circuit boards. Imagine a face full of powdered ammonia.......[powder might be ammonium sufate, but I really don't remember]
Witnessed that first hand in 1983.....had a fire in one of the "film chains" in the TV station where I worked. An over-zealous guy [NOT me] grabbed the dry powder job and blasted the electronics part of the film chain. in less than 6 hours, all the exposed copper had been etched off the boards.