Combustion cooldown not showing on action bar?

[yourmain]

I noticed that after using combustion, the actionbar sometimes doesnt update to show that my combustion is on cooldown.
Anyone else having this problem?

[Radak]

That's because combustion doesn't go in cooldown immediately.
It goes on cooldown after you get yout 3 crits so the debuff disapears

The reason for this is that other wise you could pop it 1min and 30sec before the pull. And have it ready for use again almost immediately after the start.