We have never seen a normal mode version fall. I've only seen one fall in LFR, and luckily won it. At the time I didn't realize how rare/lucky that was.
One fell this week on heroic Morchok, and went to our shadowpriest, so it went to a good place. But yes, it's unusually rare for how important it is.
"Falling from heaven is not as painful as surviving the impact."Revenant
- my guild on Echo IslesThe Old Guard
- my guild on Earthen RingHowToPriest
- a great priest forum