A neighbour said he was attacked by a man with a hammer after he and his brother intervened when they heard a woman screaming.
Donovan Phillips said he and his brother were at home on Flanders Ave in Napier on Friday night.
"At 11.30 we were woken up by the next-door-neighbour, all we could hear was her screaming," Phillips told the Herald.
The woman had been given a lift home from a party by a man, who was not her partner, Phillips said.
After his youngest brother "scared the guy off", he left their street, Phillips said, but returned just after 2am - allegedly with a weapon.