So I just finished my first campaign with my friends and I'd appreciate some feedback on a rule I was using regarding Despairs. Whenever a PC would make a ranged attack on an enemy while one of his allies was engaged with said enemy, I'd upgrade the difficulty once. If a despair popped up, they'd hit the engaged PC instead of their target in a bout of friendly fire. One of my players has always been vocal about how rough that ruling is, and I don't disagree with him. But at the same time, I feel like it doesn't happen so often that it's a big deal, and it adds a bit of danger when ranged attackers are firing into a melee fight that they're friends are tangled up in.
Is this too much? Should I be looking for more creative ways to use the Despair without hitting my PCs like that? Or is it a fair use given the situation? Thoughts?