Go To Sleep (GTS)
Because honestly, if he doesn't get to use his old finishing move then what kind of world do we live in? CM Punk is a bloody good wrestler and you shouldn't let anyone tell you any differently, because it's true. Unfortunately in MMA that doesn't matter if someone is trying to knock your head off, so you'll have to try and find a different tactic.
That's why Punk needs to go old school. He should've just picked Mickey up and pushed him a tad higher into the air, before thrusting his knee directly into his face. Whether or not it would've been enough to knock him out isn't even a question - of course it would have been. The man has knees of absolute steel and if you don't believe us, go watch pretty much every match during his WWE run. Wait what do you mean it's fake?
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Onto another move of Punk's that could've come in handy.