[It's fine, Zoro can handle this. It's kind of interesting, actually, that even though he's never wanted to volunteer this information, he's come to terms with it. Still, he keeps his scarred eye toward Sanji rather than meet his gaze, and his tone is low and quiet]

You remember the first time I faced Hawk-Eyes, at your restaurant? When he asked me why I wouldn't give up.

[with a knife plunged hilt-deep into his chest. "A promise to a friend." He's sure Luffy, Usopp, and the cook all heard it]

She was the friend I made a promise to.