That's damn crazy!! However, I think the policeman restrained himself not to shoot anyone in as much as he pointed the gun on the lady several times. Our policemen would have easily downed several guys within seconds. I say kudos to the policeman for trying to use other means to solve his issues and not shooting anyone.
He really restrained himself despite; being a muslim in Lagos (I guess Lagos is predominately Christian, now add that to the religious conflicts in Nigeria to that.), with a gun, somebody daring him to shoot, being drunk , a policeman .... If it were in Kenya, we'd be counting a handful of bodies.
NB: I do not support what he did.