Set around when Zoro asks Mihawk to teach him and Mihawk accepts. Not one of my better chapters, sorry.
"I train for myself. I fight for myself. I live for myself."
Mihawk swallowed a snort at Roronora's haughty tone. The initial relief that he would be learning from the world's best seemed to be dying down, and Roronora was finally thinking about what he had been told.
It seems you have found something greater than your ambitions.
"I do this for myself."
"True but nonetheless…" When he caught sight of the stubborn glower radiating from the younger swordsman, Mihawk's tone grew soft, almost gentle as if an adult were explaining to a child. "When a man like yourself sets his pride aside, it is always for somebody else."
Even now, the younger swordsman stared at him with a burning determination that Mihawk had seen ages back in the brown eyes of a teen wearing a straw hat. Monkey D. Luffy had had that same look when he had thrown himself at the greatest swordsman in the world-who at that time seemed to have killed the green headed swordsman-too angry to land or even aim properly. The captain had not reflected petty emotions for his own welfare then, and his first mate did not reflect them now.
When Roronora continued to glower, obviously not understanding what Mihawk was implying, the older man continued exasperated, vaguely wondering why he had agreed to teach an idiot.
"You are doing this for your captain."
The look Roronora gave him was priceless; a flash of honest bewilderment followed by something that looked like self-pity(I'm learning from an idiot). However, the reply the younger swordsman gave, with a maddening air of stating the obvious that dismissed the issue completely, was even better.
"There is no difference."