I am looking for an explanation of a mysterious scene early in Ep 8 (Season 1) of Stranger Things.
At about 7min in there is a large movement of people out of Hawkins National Laboratory, with this dialogue between Dr Brenner and Connie Frazier:
Connie: I'm telling you, this is a mistake.
Brenner: It's gone. Isn't that what you wanted?
Connie: And if they find the boy?
Brenner: That's not going to happen.
I get that Brenner did not think Joyce and Hopper would be able to find Will Byers in the Upside Down, because no one Brenner sent in there survived for long.
Were all these people going after El, or were they evacuating the lab and if so why? Why did Connie think it's a mistake? What did Brenner mean when he told Connie "it's gone"? Assuming he meant the demogorgon, why would he think so, or if he was lying to Connie, why?