Forgive me if I'm wrong, Ravi, but undercover officers (who I'm assuming are Special Branch) are supposed to be on the look-out for threats posed to the security of the audience and the structure the event's being held in; not some drunken idiot making a fool of himself.
I have to ask depending on how many Blacks or Africans in the crowd, letting this guy continue to make an ass out of himself could have started some shit.