I tried out some demo dps at the ptr and I realized that it is almost impossible to keep immolation up with hand of gul'dan :/
Immolation:15 seconds duration
Hand of gul'dan: 12 seconds cooldown, 2 seconds cast time and 0.2-0.5 secs before gul'dan reach the target.
Do you think blizzard made this with purpose so you can't get away with casting immolation once per bossfight?
And another thing, now with the change to molten core, is there any reason at all to cast shadowbolt? (except for keeping up the 5% crit)
(I'm talking about 4.0.1 regarding incinirate, since you could take imp.immolate instead of bane.)