ummm… you can stop the interview yourself any time you want. I’m not saying DON”T bring an attorney. Just saying that a BI is not a law enforcement officer and It’s not an interrogation. In fact, I use it as an opportunity to ask the BI questions and get things out in the open so I can discuss with an expert resource.
Also, in case you weren’t aware, you can absolutely talk to your FSO, off the record, any time you want if you have questions or concerns before the interview. That’s their job. They will tell you what to watch out for and when to stop the interview if needed.