Talk:Thornmail/@comment-46.186.54.225-20120225221232/@comment-67.182.209.181-20120307073823

Vayne's damage comes from Tumble and auto-attacking. Which is greater, 8% of your max health, or 150% of Vayne's attack damage? (There's a tipping point around where Vayne has 200 AD, and you have 100 Armor and 2000 health.)

Now which one can she do the second she sees you, and which one requires 3 auto-attacks?