Rapana and his friends moved around police, threatening them. Rapana told police to "f*** off".
"The defendant removed his top as though he was preparing for a fight with attending police staff."
Approximately 15 people were all behaving the same way.
"When police attempted to move forward into the address, the defendant stepped forward, swinging his closed fist at an officer."
Police used a Taser on Rapana.
When questioned about his actions, he said "How could I? I was on the ground."
Rapana appeared in the Whanganui District Court on Tuesday, where he pleaded guilty to disorderly behaviour and assaulting police.
Defence lawyer Harete Hipango said her client "really copped the good end of it in terms of receiving a Taser, a good shake-up that night".
Judge Patrick Treston said he accepted it was a "confusing situation", and noted it was lucky Rapana didn't land any of his punches.
"Nevertheless, it's serious enough," he said.
He ordered Rapana to come up for sentence if called upon within 12 months.