User blog comment:ClariS/Nalis, the Scarlet Cardinal/@comment-69.119.114.73-20121128195940/@comment-69.119.114.73-20121129194724

Sorry, I neglected to mention, the fact that it is a kill means that you have to be the one to last hit the enemy. That means you end up ksing anyone else because you have to in order to avoid death. It makes it very black and white, where you either kill them and escape with the passive, or don't and die immediately. And all passives have some use, even if they are very small at times. For example, Varus gains attack speed with his passive, but also when he kills minions and on assist. Essentially, it makes the entire issue where assassins either snowball into late game or are forever useless.