Murderbot's face doesn't change at the accusation because it isn't guilty of that crime. It hated every part of that experience except for 'no longer raging and murdering people.' It doesn't want to go through it again because 2B's unwilling to talk about her problems. Murderbot hates the thought, but not more than it hates 2B going through her horrible shit alone. Somehow, it's always easier to pay the price for whatever its doing itself than on someone it's responsible for.

Oh comes the realization with the stock buffered answer. "You can't," Murderbot says, but it doesn't sound upset. It's excited, a touch eager. It just had its head full of 9S's operating system, hardware, subroutines. It could hack a goliath given a day or two to reconstruct some of the coding. That gets tagged for later. It's going to code that. Goliaths are only the beginning. The real target, the real important one to hack is 2B.

It picks up the book it previously handed 2B. "I need this back," Murderbot says. Again, 2B can pick a fight over it, to the death, or she can let Murderbot have it.