She was dazed and confused. Despite that, the ERA finding described the incident as a fight.
"It wasn't a fight. It was a king hit," Mr Quarrie said.
"The ministry might have been justified in raising subsequent issues, but the fact is that my client was the victim of a vicious attack, not party to a bar room brawl."
The ERA's decision would be challenged in the Employment Court.
Mr Quarrie said his client felt "seriously abandoned" by management and hung out to dry.
Mrs Drader laid a complaint with police on the evening of the assault but did not tell her bosses until six days later. She was sacked on March 29 after a series of meetings with management.
She told the ERA the assault had been the direct result of her following proper protocols and processes. The way management treated her had upset her.
"I was the victim of an attack ... I felt like I was being investigated like a criminal investigation and that I was somehow to blame for it all," she said.
She accepted she should not have phoned the client but no consideration had been given to her state of mind. as a result of the attack and possible concussion. The ERA noted she had not sought medical treatment.
The ERA found Mrs Drader's dismissal was justified "in all the circumstances".