The Herald has approached police for comment.
Zhang said the incident took place when his son, who was the faster swimmer, tried to overtake the adult but accidentally bumped into him.
Watching the incident unfold, Zhang went to the adult swimmer once he reached the poolside and asked him why he did it.
He claimed the man started to swear at him and his son, saying: “My ‘f***ing boy’ blocked his way, he couldn’t enjoy swimming. He only ‘grabbed my f***ing boy’s leg and didn’t even punch him’, why should I get so upset”.
The pool’s general manager Nick Tyrrell said police had now been contacted and staff told not to allow the person involved into the facility.
“This person will need to speak to me, and details will be given to the police following that,” he said.
“An allegation of assault is for them [police] to follow through with, which we will be fully co-operating with.”
The team of lifeguards acted immediately to calm the “heated” situation yesterday and immediately asked the man to leave.
“The lifeguards observe the facility constantly, and do the very best to be proactive and reactive,” Tyrrell said.
“There was no prior alarm that would have caused them to act, and after Mr Zhang’s son accidentally bumped the other swimmer, that is when the leg pull occurred.”
Tyrrell said he had a zero-tolerance policy towards abuse of any kind within the facility.
“Our biggest priority is ensuring the safety of our customers and staff,” he said.
He said the incident would have been alarming for Zhang’s son and staff hoped the police acted quickly.
Speaking to the Herald this afternoon, Zhang said he returned to the pool today for a meeting with Tyrrell and an attempt to help his son overcome the incident.
“They’ve done a fantastic job and been very helpful in assisting my family.”
Zhang said his son was scared from the incident but doing much better.
He had contacted police because while his son was a top swimmer in his age group, Zhang didn’t want to see other kids who weren’t as strong in the water get hurt, especially if this happened in the ocean.
“Holiday season has started, if somebody behaves like that in the public pools, some kids might get seriously injured or even get killed,” he said.
“I need people to know this, this behaviour is not acceptable.”
The incident came as the Herald and Water Safety NZ are again urging Kiwis to stay alive this summer after there were 94 preventable drownings last year.
There’s also been water-related deaths at Auckland’s Narrow Neck Beach, Hawke’s Bay’s Ocean Beach and Auckland’s Rothesay Bay recently.
Benjamin Plummer is an Auckland-based reporter who covers breaking news. He has worked for the Herald since 2022.