The first punch in the chest was taken with a step forward, the second and third in the face with an elevation of the chin. The fourth, then the fifth, seemed to make him unconscious.
But when he got up and held his hands firmly behind his back, he kept looking at his attacker and over and over again at a symbol of largely peaceful opposition to an increasingly authoritarian power.
The attacker seemed to be the exception to one of Hong Kong's many "Lennon walls", which are affected by unprecedented political unrest against the erosion of civil rights in the semi-autonomous region of China.
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The walls that have been visible all over the city over the last few weeks are covered with colorful slips of paper protesting against extradition laws that the government has declared "dead," but still not officially withdrawn.
The video was shared earlier this week by Edith Leung, an employee of the Hong Kong Democratic Party, a center-left party and the third largest in the Legislative Council.
It shows a man repeatedly hit by an elderly man who later rips off dozens of plastered banknotes on a wall in Kowloon Bay.  Some people watched as he was later taken away by the police.
"What the hell is going on? That's crazy! "Ms. Leung wrote before later appealing for witnesses in the name of the victim's uncle.
Ray Chan, a former Hong Kong MP, tweeted, "In Hong Kong, pro-cops and pro-China thugs are just around the corner in your neighborhood. The young man showed real courage and wisdom as he defended the Lennon Wall.
Hong Kong-based human rights activist Johnson Yeung described the video as "painful to watch".
"I greet the young people who neither resist nor hold back against violence. He was hit in the face 13 times by a Beijing colleague and did not resist, "he said.
Young people have been at the forefront of major rallies against the extradition law in recent weeks, which would have allowed the suspects to be sent to mainland China for trial.
Activists Praise Keep up the pressure until Hong Kong leader Carrie Lam officially withdraws the bill. Many also demand their resignation.
Wang Zhimin, the main representative of the Chinese government in Hong Kong, said Beijing's central government strongly supports Ms. Lam.
He rejected calls to relieve arrested demonstrators, saying that this was "an obvious challenge to the rule of law in Hong Kong".
"With regard to the recent series of violent incidents, all Hong Kong people, including those present, have expressed their condemnation," he said in a speech to Beijing loyalists in Hong Kong.
The protests against the proposed extradition law have been feared that Hong Kong will forfeit the freedoms granted to it when the former British colony was returned to China in 1997.
Critics fear that suspects could be exposed to unfair and politicized processes in Mainland China, and critics of the ruling Communist Party could be targeted.
July 1, 22nd Anniversary of Hong Kong's peaceful handover from Britain to China The march attracted hundreds of thousands of people, but was overshadowed by an attack on the territory's legislative building.
A few hundred demonstrators ransacked the building, spraying slogans on the chamber walls, overturning furniture and damaging electronic voting and fire protection systems.
Tens of thousands of people attended the recent rally on Sunday and tried to convey their message of protest to those on the mainland, where the state media did not fully explain the protests.