Probably locals detailed to the regional JTTF under the FBI. Massively increases their manpower footprint over career agents. The female knows that this threat assessment is almost certainly unconstitutional and wants no part of it. Probably having second thoughts about this assignment and wondering if it's worth it to get to play FBI and get fed automatic overtime while pissing on citizens constitutional freedoms.
That said, if the citizen WAS making credible threats, this would be a different matter. It would seem however, that based on the ice skating by the two males and the active avoidance of the female, the officers know this was a fishing expedition. Since it involved The First amendment to the constitution.
They were sent there no doubt. They know better and it shows. All cops know the constitution and it amendments. It's the very first, largest, and most important academic block in any academy. If you don't pass that, you're out early before any more coin is spent on your dumb ass. That means they've taken and passed many, many tests on the constitution and know they're on the edge if not over the line.
When you see cops huddling on calls, it VERY frequently is discussing procedural and constitutional issues to avoid problems with either.
This is going on in every city big enough to have a JTTF I'm afraid. A compromise of character and oath is disturbing to witness. That lady especially needs to reconcile her conscience and go back to her agency, even if it means back to patrol on the midnight shift.
Following unlawful orders is unlawful.