Perhaps against the advice of, well, anyone with a brain, Gabriel is going to try and right himself--he doesn't like having a conversation while he's totally at the mercy of someone else, and he might be banking on his enhancements to get him in his right mind a little sooner than it might take an ordinary human.

"I just went through all this trouble to get that thing out of my head."

That said, he's not rejecting the offer entirely--he just wants to know more about it.

"And now you want to put another one in?"

A UNA implant, no less, and Gabriel isn't sure how he's supposed to trust that it won't just put him under the thumb of the government. He knows the impossibility of walking out of here without an implant, but he's never stopped thinking that he'll be able to figure out a way around it.