Alvin, a heating engineer on his way home from work, had intervened to comfort a teenage girl who had been collared by the duo for allegedly spitting at a bus stop.

Alvin, a heating engineer on his way home from work, had intervened to comfort a teenage girl who had been collared by the duo for allegedly spitting at a bus stop.

Alvin, a heating engineer on his way home from work, had intervened to comfort a teenage girl who had been collared by the duo for allegedly spitting at a bus stop.