Vayne does have a special condition with Runnans. Her Silver Bolts require consecutive attacks on a target, so unless
wasn't activating, she would actually lose her silver bolts. Instead how it works in game is it only counts the main target for the bolts. If it was done as written in game, she would lose the bolts entirely with more than one target,but she does not.
I'm not saying we don't need more conditions, but it is hard to take your post seriously when there is a glaring inaccuracy in the example of why we need more conditions, because if you played Vayne with hurricane even once you'd know that condition existed. Vaynes cannot abuse Runanns except for the attack speed.