private IEnumerator UpdateCoolingDown(ManaSlot slot)
{
float cd = 0;
float rev = 360f * slot.GetCooldownTime(); // one revolution for each second of cooldown
while (true)
{
cd = Mathf.Pow(1 - slot.GetCooldownPercent(), 2);
transform.rotation = Quaternion.Euler(0, 0, cd * rev);
if (!slot.IsOnCooldown()) break;
yield return null;
}
SetSpellIcon(empty_slot);
}
