Tear of the Goddess is charged upon spell cast or mana expenditure.
Takedown (Q) and Swipe (E) charges Tear of the Goddess despite not costing mana.
Alternatively, Pounce (W) and Aspect of the Cougar (R) do NOT charge Tear of the Goddess, despite being spell casts like Takedown and Swipe.
Tear is charged upon SPELL CAST or mana expenditure. Since both Takedown and Swipe are spell casts, they are meant to charge tear.
Well, I know for a fact that Nid's R, along with Jayce and Elise's R, are not meant to charge tear. Riot made it that way quite some time ago. However, Pounce is supposed to charge tear, so if it doesn't that is a bug. But keep in mind that tear can only be charged twice every 8 seconds. If you look at tear in your item slots, you will notice that it has a cooldown timer whenever you charge it twice within 8 seconds, and you can't charge tear any further while that cooldown timer is still going. So it's possible you may have used Pounce while that cooldown timer was going, which would explain why Pounce didn't charge tear. If this isn't the case, though, then it is a bug.
