[Gameplay] Spells with a link checking the distance condition after the damage rather than before
Spells like Leblanc chain, Fiddlestick drain or Morgana ult do their distance check after the damage, this is why you can flash away from the edge of a Morgana ult and still get stunned/damage. Here's a video example.
http://www.youtube.com/watch?v=7gC1LY4cCyg&feature=youtu.be
Would it work as you'd expect the game would check if Leblanc was within Fiddle drain range right before dealing damage and would realize it's way too far so that last tick of deadly damage would not have been dealt.