Ace has so many mixed feelings about all of this already. It makes him nervous in a way that he doesn't quite understand, and he has a feeling that Luffy has ignored something important. He does that, if it's not important to him, what bother paying attention at all?

"So I gotta keep enough..." Ace muses, for a moment. "So if you need to make any, you come to me fast, okay? I'll always hold hands with you." But when Luffy brings up that any physical contact helps to get Chroma, Ace is starting to wonder about this place again. "...Hey. Does it all make the same amount of Chroma?"