"In the altercation the shotgun was fired once at the ground and fortunately no one was injured as a result."
One of the people then fled the tavern and got into an altercation with a staff member, who received a minor wound as a result.
A 25-year-old man who was held by the patrons required medical treatment and will be facing a number of charges.
However, the second suspect is still outstanding and it is possible that he got into a waiting vehicle and left the area.
"There was no money taken in this incident, however it had the potential to have a far worse outcome," Clayton said.
"I would like to acknowledge the patrons' assistance in this incident, however we generally discourage people from intervening in these situations for their own safety."
Anyone who witnessed the incident or who has information can contact police at (09) 430 4500."
They can also contact Crimestoppers anonymously on 0800 555 111.
A post on the Tiki Tavern facebook page says: "Just want to inform you, we will be closed today, due to some circumstances. We will be open on Saturday."