[Gameplay] Kalista can use rend (E ability) even when she doesn't have enough mana for it.

Not a 100% sure if this is intentional, but Kalista can use rend (which costs 30 mana) even if her mana is below 30.

How to reproduce : Spam kalista's skills till her mana drops too <30. Attempt to rend(E) a target while under 30 mana. Rend will activate even if you don't have enough mana, and mana will immediately drop to 0 (unless you executed a target with it, in which case mana is dropped to 10-30 depending on ability rank)

example - https://www.youtube.com/watch?v=-FZ-un8fTuk

Pretty significant bug in the early levels as it allows kalista to spam her E on CS and trade with enemy over and over without having to worry about not having enough mana for rend.