I have seen the black smoke attack on wild ones, did almost 50% damage on my tamer while I was vetting my pet. As to how to repeat that attack on tame ones I have no clue. It will do the "trick" command and there is no damage to anyone, just smoke. Of course if there was damage there be alot of folks in GZs getting wacked.
Probably similar to the swampies that we could dismount the npc rider,,can't remember the names they were called, but you could dismount the rider, and tame the swampie, and they lost their special attack too. Some sorta stomp or some such trick. Chaos riders?? was that it?
I remember now, the savage riders that ride those ridgebacks, have the stomp, the Chaos riders had the swampies that did a fireball attack, as I remember, but in all cases, they lost their special attack after being tamed.