It was a nasty break, the kind of thing that can be permanent. I thought there was nothing else I was good for.
When Tsuna came up on the roof, I thought he would understand feeling that desperate, but he didn't even try to be understanding. He just said it was impossible for him to think so extremely, that he would always be too scared or have too many regrets should he die. He'd always want to go back and do it better, with a dying will.