Bug with Jax's E and Aatrox's Blood Price
http://i.imgur.com/p0HlwrY.gifv
Since the bonus damage from blood price naturally ignores Jax's E, and the buff isn't reset when its used on Jax due to a recent patch, Aatrox can damage Jax while he's in his E if either Jax misplays or Aatrox times it. I think this is worthy of a bug fix next patch.