Just because he gave up doesn't mean he didn't lose. There's only win or lose, what does giving up lead to? A loss. So what if he could've (barely) won, it doesn't change the fact that he was too weak to save his mother. That doesn't sound like invincibility to me.
hero4hire:he didnt lose, he gave up to save his mother's life. Also, he's like 15 when he fought a bunch of heroes from top #10 ranks.