[GAMEPLAY] Kalista's Rend Improperly Going Onto Cooldown

This is technically working as intended, but it is still annoying to deal with. Whenever you use Rend while auto attacking, it casts it twice, but when you kill something with the first cast of rend, it resets the cooldown, but if the enemy that to auto attack is flying to doesn't die from rend, it places rend on cd.

1. Place enough spears on minion so that rend will kill it.
2. Throw spear at another minion.
3. Use rend while spear is in flight.
4. Rend will go on cooldown even though you killed a minion.