The pair were putting on the 12th green in a tight match when they heard screaming and obscenities coming from an adjacent property, followed by what appeared to be two gun shots.
They immediately rang 111 to inform the police and remained on the 13th tee while the following groups played through.
The police arrived on the scene in golf buggies and, as the drama unfolded, play in the final round was delayed for almost two hours.
"As yet we are not aware of the outcome but I assume all is well as we have at last been given the go-ahead to play the final round," Geary said.
After play resumed, Geary chipped in for a birdie to win the 17th hole but Sincock responded on the final hole with an eagle to halve the match.
As it turned out, the nearby resident was using his ride-on mower to cut his lawn but he let out a string of obscenities when his mower blades hit a concrete path.
He then belted his bent blades vigorously in an attempt to straighten them which the golfers mistook for gun shots.
Had the final round been cancelled, Waikato would have won the title with seven wins from seven rounds.
But it was still in the driving seat with 24 games when it teed off against Auckland when afternoon play resumed.
