Agreeing to not ask about Antonio Brown sets up a no-win situation for everyone. If Jacobson (or any interviewer) follows through and doesn't ask about Brown, people will say it was a softball interview and they were afraid to ask the "tough questions." On the other hand, if interviewer breaks their agreement and brings up an out of bounds subject, it's fair for the interviewee to think "WTF? We established we weren't talking about this."
I read a lot reactions about the "death stare" on twitter yesterday, but didn't get around to watching the interview until today. The whole Q&A in question and Belichick's departure takes place in 8 seconds:
The way it was built up, I was expecting Bill to fold his arms, raise his chin and glower and Jacobson until she shrank away in fear. Instead, the "death stare" maybe lasted 2 seconds, if we're being generous. This is just another example of something being overblown because the Patriots were involved.