Comment 9 for bug 895225

While it would be cool to have each unit check whether it actually could attack the offender, this is a bit too complex to implement. It essentially is like what you describe already, but all units will get the new target without checking whether the individual unit can actually damage the attacker. If it won't make the game slower, this might be added later; for now the game can do more than it could before, just not for balloon hover units.