Self-appointed 'Facemask Police' gets knocked out by man pushing pram

Since Boris Johnson made the wearing of face-masks in public places mandatory, we have seen self-appointed 'Face-mask Police Officers' emerge.
One such 'officer' was haranguing rail staff for not wearing face masks at Clapham Junction station in London.
During his high-pitched rant, the busybody turned his attention to a well built male pushing a pram who was also not wearing a mask.
The pram-pushing passerby took exception to being heckled at by a meddling stranger, and knocked the man out.
Some people do not like being questioned!