Sounds a bit better than "Drop multiple grenades and hose the hell out of him till he drops. If another FP is due later in the wave, I'd kite with the pistol and look for weapons. Once the next FP shows, hose him until he drops." even though I still don't see how hosing pounds is any good at all.
If anything, you should try to ignore them until you have something that can kill them.
on suicidal, as a firebug, what qualifies as 'something good to kill him?'
A shotgun, a bullpup, ect all seem more likely to enrage a pound then kill it, especially if its a firebug pulling the trigger.