Interesting... I was thinking it would something trogdor-esque ... but soccer hooligan works pretty well too.
I love the picture you found for it....
I'm guessing from the name of the skill cost you picked air to represent it shouting vicious inciteful (yes that's a word according to the Oxford dictionary, its just not common) cheers at its comrades.
... Interestingly enough it could be used offensively to make heavy hitters loose hp more quickly vs. fire shield