Correct me if I'm wrong, but isn't this a buff for scorch?
Basically the damage has been cut in half, but so has the CD. So damage over time is the same. However, now it has a lower cooldown than manaflow band. So now when you cast a spell for manaflow band every 15 seconds you will always have scorch. Currently you have to wait 5 seconds. So now you get to play your manaband optimally while always applying scorch.
Am I crazy or is this not a very nice buff?