When you get 5 stacks of Felblood - Spell - World of Warcraft you'll transform into demon for 60sec, but you can't mount in this form, however if you HS and use use Burgy Blackheart's Handsome Hat - Item - World of Warcraft , or savory deviate delight or other transform, then mount up and cancel the last transform, you can stay mounted as a demon (and your mount gets smaller).
I've tested many different transformation buffs and almost all of them seem to cancel each other, but fel infused can still coexist with most transformations in this way.
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