User blog comment:Willbachbakal/(Champion Rework) Nocturne, the Eternal Nightmare/@comment-25228021-20150509162236/@comment-1330314-20150509200806

rocket can be used to take down multiple targets at a time, especially at the end of teamfights when multiple targets are low. By contrast, Nocturne is going to be specifically focusing just one target. Carry-over damage would encourage him to seek out the lowest-health target and try to execute them, and when killing camps would allow him to finish off smaller monsters much more quickly after killing the large monster. Since Noc would still be focusing on one target even with this ability, it would make sense for the damage to be based on just that target's health. In fact, if the ability's damage were based on the health of each individual target, it would likely be counter-intuitive, since Noc would then become an AoE executioner, which is not the intent.

Stealth also doesn't grant unit collision removal, just invisibility. Opposing champions wouldn't be able to tell that they'd be blocking him because he'd be invisible, unless he were to specifically phase out when bumping into enemy champions. The point I'm trying to make about his E is that it is a skill that requires him to pass through enemies, since that's how it deals damage. If he were unable to ignore unit collision with his E, the ability would be unplayable on its own, which is never a good thing. Even if he could rely on his Q to provide unit collision removal, that would just mean he'd end up with an active that would only be usable when accessing another active, despite needing just a tiny adjustment to function independently.