Darius E bug

I was playing LeBlanc and the other team had Darius. I used my W then R to go in on him and immediately hit W again to go back. As I was flying away from Darius he used E and while I was at the end of my animation (I was comin in on that sigil hot and fast) I was pulled all the way back to mid lane from the south river bush. Idk if LeBlanc is supposed to be targetable mid animation or not, but I'm pretty sure a blind pull should not bring me back when I am completely clear of the attack.

Edit: He was the maximum distance away from me. I used w and r as far as they could go to hit him once.