when I was using Nova, it was Procing with the Element of my MH, but it has been over a year since I used any OH Mythics. here is a post in Question Thread I made on the subject, and 2 spaces down I decided not to do a bug report with more comment on the subject.
if you’re using MH Skills with Ice, with Fire on OH, they won’t give you Immolate. if you have Elemental Crit Chance (Wizard Talent Wizardry or Legend affix), all Elements from Prismatic ability will have a chance to Elemental Crit. if you have Freeze (Epic) with Prismatic, your Ice Weapons will have a chance for all Elements to Elemental Crit. if you have Immolate (Epic) with Prismatic used with an Ice Weapon, none of the Elements will Elemental Crit. Epic Elemental Crit works like ED% & ED+ when it comes to Weapon Element.
@macon so basically, your Ice MH Skills wont Immolate for making Crushing Flames useful. they would cause Freeze instead.