The person then approached the teenager and police allege he punched the teenager within the head, knocking him to the bottom earlier than hanging him over the pinnacle with a glass bottle.
The person left with buddies and was final seen strolling alongside King Avenue.
Emergency providers responded and paramedics handled the teenager for head and facial accidents.
He was taken to the Royal Prince Alfred Hospital in a secure situation.
Photographs of a person who police imagine could possibly help with the investigation have been launched.
Police describe the person as being of Caucasian look, aged in his 20s, of medium construct, with black quick hair and a beard.
He’s proven sporting a gray hooded jumper, black denims and footwear and carrying a black jacket.
Anybody with data is urged to contact Sydney Metropolis Police Station on 9265 6499 or Crime Stoppers on 1800 333 000.
