Simple Aatrox change
Start 
E behind him like 
Q. Since you usually want to Q E onto your enemies but generally miss.
2 Comments
I was thinking giving him the ability to unroot with q like the new jarvan buff would be strong. I like your idea, just doesn't make sense from a physic point of view. His blade somehow starting from behind him.
Or maybe have 15% tenacity while q is up?