I think it is a congresswoman personal security.
I believe that it was some one on Nancy Pelosi’s security team and they were reacting to the loss of the lap top that had been taken by someone minutes before the shooting. I believe the theft was viewed by security as it happened and that becouse of masks no clear identification was made but a verbal description went out over security coms. if you look at the lady who’s house in Alaska was raided by the FBI looking for the computer you will find that both women are very similar in features.
I will admit all of this is very speculative in nature it is just me looking for a reason for what happen.