Talk:Thornmail/@comment-190.230.70.227-20111024014623/@comment-4434378-20111024015107

IIRC Lifesteal is based off how much damage you DO. Whereas damage return is applied based on how much damage you do if it was true.

So if the target has 300 Armor, then you would only do 25% your AD in damage. You lifesteal 75% of this so that you are healing ~18% of your AD every shot. However, thornmail is returning 30% of your AD as magic damage. So you are injuring yourself still.

Of course, there is no reason to attack a 300 Armor target if you don't get Last Whisper, and MR reduces the damage that thornmail deals.