ya thats a cool concept!
also remember that trick when making spring traps. you know those ones where you hit a trip wire and a bunch of spears tyed to a branch comes out a squres you, ya that would suck LOL!
also for those that dont know how to fire harden the tips:
place the end in the hot briquetts or red hot ash and keep it until the ends get a charcol coat on them. but make sure it doesnt start on fire and burn too much.