I thought this plot couldn't be any more garbage. Than it decided to rip off Dragon Ball, with that Super Saiyan-esc form. Like really, you can't think of a decent enough plot on your own, so you start taking from other people's homework?
so if im understanding correctly, the reason he answered with the collarbone in that other chapter was because he remembered a slave pact placed on him. a free neck with no chains that bind him