Maybe they were operating under the delusion or false information that they wouldn’t be arrested for what they had already done.
They were followed by a helicopter. You’re seeing the FLIR mounted on it. If an FBI negotiator told them they could go to the meeting the FBI would know when it was. Smarter to draw them out than storm in.
You're a SPECIAL sort of idiot, aren't you? A HELICOPTOR?
You realize that you would see downdrafts from the rotors on the snow at that distance, don't you?
The trees would be moving around, etc.
Geex, I don't know what to tell you.
Look - there was NO helicopter. It was a drone.