"Charming." She sucks her teeth.
She collects the information she can. They won't tell her where they found the thing, or how it learned to speak English, but she can read through the first interview logs. They ask why it killed "those farmers," it says they were "disgusting." She starts a text document just listing all of 682's favorite epithets for humans. "Foul bags of tissue", "sack of organs", "meat", "wet salt", et cetera.
...They could get it to talk at first. It sits and answers questions, with a researcher and a D-class right there, and it only kills the D-class when they move in closer with the microphone. But the common wisdom, borne out by later tests, is that 682 immediately kills any human being in the room with it. Did something change?
Well, they tried to kill it a bunch. It was hostile to humans before then, but - well, in a human being, "murderer willing to be interviewed about their murders" and "beyond reason, kills any other human they see" would be a pretty big jump. And that's the whole point - they're not parsing 682's mindset and motivations in detail because it's just an animal to them.
And then there's the issue of the acid. 682 gets exposed to lots of stuff that sounds a lot scarier, to her, than hydrochloric acid, in some of these termination tests. They put it in 536, change the laws of physics to turn it into - stuff she doesn't even understand, what the hell is neutron degenerate matter - and it comes out the other side hale and hearty.
I could swear, at one point, that thing looked like it was actually enjoying the experience.
She would not expect something that can be dissolved down to the bone by ordinary non-anomalous acid to survive an experience like that.