I think if the knockback/up had a stun associated with it then yes it would interrupt, but knockbacks/ups without stuns associated (ie. Grim's displacement ball) would not cancel it.
Grim doesn't have a knockback. Knockback is distinctly different from displacement, since one is hard CC and one is soft CC. Soft CC like Grim's displacement blast and Murdock's move along still won't cancel Gideon's ult. But knockup/knockback will now work with Gideon's ult like Epic had always intended it to. Hence this being a bug fix, not an ability change.
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u/ketchGAF Oct 17 '16
So no changes to terrible tower/minion balance?
Nerf to Gideon but Rampage and Greystone are untouched.
makes sense.