"Anyone would be traumatised to be beaten up like that. It's not something we expect in New Zealand."
Power was speaking on a live feed being run by the protesters.
He can be seen sitting on a park bench outside Parliament grounds, unable to go back in following his arrest.
Power said he was now spending his time preparing a case against police, a private prosecution, to fight the hundreds of arrests made over the past few days.
He said they would be gathering at the Wellington District Court at 10am on Monday and would be pleading not guilty to the charges against them.
Power said there was no legality to the arrests, and they had plenty of evidence thanks to video taken of the protest.
"We have the right to be on these grounds. Come, we need people here, that's what gives us safety in numbers and makes the point. But come peacefully, this is a peaceful protest. We will do no damage, no harm."
Last Friday, Power tried to lay a complaint against Health Minister Andrew Little at the New Plymouth police station. He called for his arrest for "continuing crime" through the Covid-19 vaccine programme.
Protesters angry about Covid-19 restrictions and vaccine mandates have occupied parliament grounds for four days now, and have been trespassed by the Government.