Don't forget the OPKO fight against the guy that thought it was a good strategy to insult the coach.
One of the first times we've been teased about how powerful Ippo could be if he was angry, and he's rarely angry. But that's part of what Takamura was insinuating with that "line" he made, as Ippo will never reach world heights if he doesn't stop being a goody-goody and let loose.