Darius delayed pull (not entirely sure if its intended or bug)

When darius uses hit e to pull you toward him, if you flash away you get the full distance of the flash away, then it brings you all the way back to him with what looks like a massive range pull. I really noticed it when playing ezreal when i double flashed away and got pulled the full length of lane back to him. Not entirely sure if this is intentional or a bug, but I figured I'd throw it out there.