Shocking footage has emerged of a young partygoer who was allegedly set alight after being sprayed with flammable liquids . The footage , which was recorded through the sharing app Snapchat , shows the 18-year-old man without his pants on as his friend lit his leg on fire at a party in Collaroy Plateau in northern Sydney . As the group giggled in the background , a second friend is seen leaning in as he sprayed the young man 's leg with aerosol . Scroll down for video . Shocking footage has emerged of a young partygoer who was set alight after being doused with aerosol . He sustained 'superficial but excessive burns to his back ' after the fire quickly spread up his leg when he was with friends at a home on Essilia Street about 12.20am on Sunday . It was alleged that the prank was consensual after he agreed to be set alight but moments later , friends desperately called for help . He sustained 'superficial but excessive burns to his back ' He sustained 'superficial but excessive burns to his back ' The man was taken by ambulance to Royal North Shore Hospital and remains in a stable condition . Another 18-year-old man who was arrested at the scene and taken to Dee Why Police Station to assist police with their inquiries , has been released . A NSW police spokesman told Daily Mail Australia they could not comment further on the incident as to how the young man sustained severe burns but an investigation is underway . 'Nothing further at this stage but police are continuing to investigate the incident , ' a police spokesman said .
An 18-year-old man remains in a stable condition at a Sydney hospital . The young man allegedly agreed to be set alight with flammable liquids . The shocking footage was recorded through video sharing app Snapchat . Police are investigating the incident as arson and have appealed for witnesses who may have seen anything suspicious before it happened.