JuliaM (you won't see her coming) correctly identifies the issue. No-one should be surprised that a policeman would overstep his authority. After all, it was his desire to boss people about that drew him to the job in the first place. Everyone faced by a man in police uniform should be on their guard. What is shocking about this story is that the (formerly) sturdy yeomen of England submitted in such a docile fashion.
Did no-one in this group of royalist loyalists even think to object? When will the British people understand that the law is theirs. It does not belong to the lowbrow hirelings employed to enforce it?