[quantum_mechani]

Originally posted by Zath:
I think the answer being sought is that Aim can miss too. Chances are those Sauromancers were just trying to target the ranged units next to your City Guards and didn't quit hit their mark.

No, I'm quite sure he was aiming for the city guards. It happend several times and in each the guards were at the edge of the spell's range and the only other units to aim at were himself and units on the other side of the spell's range.