Aaah thanks guys. I realized after I died a couple times and that Mace was behaving like Yoda in his event that I must have unlocked the next level of this challenge without realizing it (maybe I looked away). I used to just auto this challenge and win, now I'm grappling just to finish haha.
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Stun or meter drain. RG's basic attack can stun him and Teebo's basic can drain his meter, essentially locking him down.
New icons, new difficulty=awesome.