the comic he didn't use the elements in the fight, just to stop it, so, we can't say for real if he use magic in the fight
we still have to consider what version is canon and what not
its not that the rules are vague, the rules are simpleNot trying to argue about fairness or equal. Just trying to point out that the rules for Mok'gora are very vague in the story at best.
but sometimes, in some fights, they bend the rules, change sometimes with the accord of something, like they choosing to do the duel not to death
this don't mean the original an base mak'gora was not to death, its the base rule, but they change to adapt in a context
same with magic being allowed, in the fight of the paladin and shaman both could use magic, so they adapted the original one to be fair, thats why they allowed one weapon, magic but only letter armor, cause one would use plate and the other not, taking away the fairness of the combat