Once she got him out of the water the woman noticed blood pouring down his head, neck and into his wetsuit. The "rogue surfboard" had given him a 5cm laceration on the back of his head.
The woman applied pressure and asked a neighbouring family to fetch the lifeguards. Three lifeguards attended to the boy. The woman said they were just amazing as they talked to him gently while checking his vitals, blood pressure and heart rate and administered first aid.
An ambulance was called and the boy was taken to a local GP who glued the wound together.
The woman wanted to raise awareness about water safety. She said her son was a confident, competent swimmer but that didn't protect him from being "in the wrong place at the wrong time".
"I trust my children. This injury was of no fault of my son's but had he been knocked unconscious, he could have drowned.
"I just think parents need to be really conscious of the dangers of water. It doesn't matter how old your child is, there are unforeseen accidents that can happen if they are alone. That's when tragedy strikes.
"I was so thankful I was there."
Her son can't swim for a week and can't run for a few days which he is absolutely gutted about, the woman said. He was due to complete the last day of his rookie surf life saving programme tomorrow, which involved a big sports competition he was no longer able to participate in.