If the mini knock back on Ornns E is removed please compensate by removing the self-inflicted stun.

That mini bump buys Ornn just enough time to un-stun himself after dashing(long delay after animation which roots him in place and spell locks him for like .5 seconds)

I get that it was overpowered in the offensive part but without it Ornn's performance will be severely impacted as he will be much more vulnerable and counter able after casting E without the secondary terrain collision effect.

It would make it so if he doesn't get a successful terrain collision knock up on his target, he basically just gripped himself to them(because of the reverse stun)

Cut the lock out/root/self-inflicted stun duration in half(guesstimate .25 sec down from .5), or allow his Q or W to cancel the animation and I think it should be just fine.