Is Halsey’s revenge comment real?
I’d say partially. I think she’d have no compunction about taking out Palmer who tried to kill her. It’s obvious those two have issues with each other.
But the UNSC (read Humanity) though? No.
She did NOT create the Spartan project to save humanity. She created it to quell the insurgency by outer colony rebels. It just so happened that the Covenant came along at that time and the Spartans were redeployed to take on this newer more dangerous threat. So she doesn’t have an issue with humans being killed. But it has to be for what she considers the right reasons.
The Librarian chose Halsey. Why? It’s plainly obvious Halsey is the most brilliant mind at that point in time of humanity. She created Cortana who was unique among AIs. Let’s not forget Cortana while in the Forerunner system met the Librarian. Likely the Librarian looked at all the information Cortana had and was able to asses who best to give the Janus key to, that being Halsey.
I can’t see Halsey being out to kill humans this time around, again with exception to Palmer possibly. I’m positive she’s just playing Jul M’dama like she has countless other persons in her life. She’s a master at that.
As for her arm? I’m betting she makes a robotic arm for herself. Who knows, she may even make a whole robotic body or a suit of armor for herself? Is that idea outlandish? No so more that super soldiers of the future battling aliens. So it’s completely possible within the realm of the Halo universe.
-Sal