Board Thread:Episodic and Issue Discussion/@comment-4928331-20130305235618/@comment-34954086-20130307002916

Ninja 989 wrote: Hmm, from watching the clip again, I'm getting the sense that since manta was a late recruit to the light, maybe he wasn't aware of the agreement between the reach and the light, if there was one. I'm getting the sense that they made him a member just to sweeten him up and keep him happy and on their side. He does command a fairly substantial army.

...Or you should read up on the character. Manta's entire mission statement is freeing black slaves essentially and giving them back a nation. It makes complete sense for him to irk up at pasty folk telling him that he's their slave.