If their comms were jammed or communications were sabotaged in some way even the best agents on the planet would be in big trouble.
That is what I think happened that day.
Yeah this guy was just making the photogs move from an area they shouldn’t have been in.
Most plausible explanation. The “B”-team was there because the “A” Team was with the “Doctor”. Total incompetence and higher up laziness caused the death of one person, almost killed the former and future president and critically wounded two others.