The Siege of Evil

What is the might called firepower if not for this. You ignite the bastard as you have done hundreths on this siege. Fire does some great work of the attacker. But one thing it doesnt do is distinguish friend from foe. And as fate would have it the knight assigned with your protection jumped in. You just blasted your only guard, and many more attackers may climb that wall before the siege is done. What are you going to do without someone to watch your back?