His friend helped keep him afloat while calling out to lifeguards. The guards rushed out, helped Thawley back to the beach, immobilised him and prevented further injury.
While Thawley was dazed and wondering what damage he'd sustained, East End lifesavers used their skills to keep him safe before an ambulance arrived.
An MRI scan revealed two ruptured discs at the base of his neck. Five weeks of rehabilitation followed before Thawley could return to work. He is now healthy, happy and grateful.
"You can imagine if we weren't in the patrolled area, how much more serious it could've been."
Lifeguard Richard Kannemeyer said people like Thawley made life easier for everyone at New Zealand's beaches. "People are becoming more aware of dangers at the beach. People are listening to what life guards have to tell them."
Kannemeyer, club captain at Mangawhai Heads, said sensible swimmers and dismal weather combined to halve the number of rescues his club performed this season. But they have still rescued 20 people - kayakers, swimmers and surfers - since late October.
Many Kiwi life savers are volunteers like Kannemeyer. He spent every weekend driving to the beach from Auckland - a round trip of nearly three hours.