does gp orange still stop knockups?

Okay woah, there's a misconception that needs to be cleared up.

Knock ups/backs are actually 2 pieces of CC combined, a "stun" and a "displacement".

You can in fact cleanse the stun part of a knock up, creating some odd scenarios like firing GP's W then Q while midair.

You can not cleanse the displacement part of a knock up. Displacements can only be broken by yet another displacement, like a second knock up or certain movement based abilities.

EDIT: Just so we're clear.

The "stun" part of a knock up has nothing to do with the actual hard CC Stun.

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does gp orange still stop knockups?

No. Never did. Knockups can't be cleansed, and they can't be oranged either.

Never did to begin with bucko.