"So you were alone."

Good to have that confirmed. Cinnabar gets to her feet; she immediately summons a replacement spear, not to strike at him with just yet, but to hold ready if she needs it.

"Why? What do you get out of this?"

He's a Diamond, made to rule. Always at the top of the heap, seemingly above the cares of the common gem. He was surely in line for a colony of his own sooner or later. Why would he walk away from that?