You were at the Kidd's pirate ship in the kitchen, helping Killer with cooking lunch. Sometimes when you mess up on something, Killer will teach you and show you the correct way to do it/one for the food. But of course, in a gentle, kind manner since you're technically the only crewmate who isn't THAT chaotic like the Kidd's pirates. And that is why Killer is kind, gentle with you. He wanted to treat you rightly than the chaotic others

"There we go. You're now doing it much better!" Killer comment as he chuckled, continuing to chop the vegetables for the food