I bet you he was doubled and saw a chance to attack his case officer. Or his case officer saw a chance to clean up his case file.
Clear up his case file?
He would be seen as a hero if he got info to “clean up” the Boston bombing, not so much killing someone before they could give you info on the bombing.
An armed agent is left alone with someone that is known to be a MMA fighter which has admitted to being involved with multiple murders and connected to known terrorist.
Story just doesn’t add up.