Hecarims run through E still hitting when flashed or Hexteched out of the way

Just like a skill shot, when someone flashes or uses a dash, they can avoid the ability. Why is Hecarims E non-dodgeable? I mean, right before he hits you, with some wiggle room, you flash or dash out of the way and yet, even though Hecarim isn't near you, the charge still hits so it looks awkward as hell. You have Hecarim charging through air, the target who flashed out of the way, being charged into by air. Make this ability more realistic.