A cocaine-fuelled teenager who brutally knocked out a party-goer in an unprovoked attack was caught ‘celebrating’ over the person’s unconscious body on CCTV.

Jayden Swift, 19, punched the man in Barnsley town centre in South Yorkshire on January 11 after a night of drinking and taking drugs such as cocaine, Sheffield Crown Court heard.

The victim tried to come to the aid of another man whom Swift, then aged 18, had ‘punched 20 times’ and left unconscious just moments before.

CCTV footage shows Swift exchanging punches with the second man before hitting him in the back of the head.

After the victim collapses, Swift then kicks him in the head before raising his arms in celebration and pointing at him.

As he attempts to leave, Swift then kicks the man in the head once more before a male police officer arrested him after onlookers called emergency services during the incident.

The court heard that the incident unfolded after Swift had a brief conversation with the first victim before launching into what the judge, Recorder Jeremy Hill Baker, called an ‘unprovoked, senseless and serious’ attack.

Recorded Hill-Baker said about the first attack: ‘That he did not suffer life-changing injuries or lose his life is frankly astonishing.’

Prosecutor Stephanie Hollis told the court during a sentencing hearing on September 30 that the first complainant suffered injuries to his head, and above his eye and temple along with a blackened eye.

Swift, of Darfield, Barnsley, pleaded guilty to two counts of attempting to cause grievous bodily harm with intent.

He was jailed for four years and one month and given a 10-year restraining order protecting both victims. He was also ordered to pay a £228 victim surcharge.

Jailing Swift, Recorder Hill-Baker told him: ‘You punched him repeatedly, you knocked him unconscious.

‘You then – as the CCTV shows – kicked him to the head with some force. And again you appear jubilant…you returned to kick him in the head again.’