[SUGGESTION] Adding a "kill" indicator for Kalista's E

What would you guys think about adding an indicator when Kalista's E can kill her target, pretty much as there's one for Zed's ultimate and another one for Cho'Gath's ultimate?

I think currently Kalista's E has 2 interesting gameplay interactions:

1. I use E for the slow now, sacrificing the possibility of doing more damage by not activating the skill yet and stacking more spears.
2. I use E for damage now, because I think it may deal heavy damage, or I keep throwing autos at the risk of overkilling the enemy and wasting damage, but killing him immediately and having my E again instantly.

In my humble opinion the first interaction is cool, but the second one isn't, because while it's something that can help differentiate really good Kalista players from not so good Kalista players, that difference is only real because the game is not giving enough information to let that interaction be a real choice. If I choose to continuously attack an enemy to stack him with enough spears so that I can kill him, but I don't know when that's gonna happen, I'm not making a choice, but playing a guess game. So I could be making a mistake and be frustrated because of not having enough information, and when that happens, a lot of players tend to get frustrated with the game. That kind of frustration is usually bad for the perception of the game.

Just my opinion though, what's yours?