Talk:Master Yi/@comment-14794231-20130807163505/@comment-7095057-20130807170047

It's a similar effect to when you use an item like Wits end or watch Corki autoing. You'll see his bonus true damage as a different, seperate damage counter from his real damage. That damage is counted as ability damage and thus doesn't factor into Thornmail.

If it did count, Yi would gain bonus lifesteal off of all the true damage he'd be dealing.