During the ensuing fight, a man who lived at the home grabbed a kitchen knife and stabbed it into the chest of an 18-year-old man.
"One thing led to another and both of them are lucky there wasn't a death."
The injured man was flown to Waikato Hospital, where he was in a stable condition following surgery.
Mr Mastrovich said four people had appeared in Taumarunui District Court after being arrested the incident.
Police were looking to arrest six more by the end of the day, he said.
"We're looking to send a message that we're not going to put up with this. We'll get the message through to them."
- Herald Online staff