Old and expected behavior: killing a drained enemy with weapons or the void soul itself would refund a small amount of class ability energy when the healing rift is equipped. Any kill from any source as long as they are being drained. Current, bugged behavior: with the healing rift equipped, only kills where the void soul gets the final blow will return class ability energy. This is bugged, weapon kills on drained enemies are intended to return class ability energy but no longer do.