The 111 emergency number had been dialled - a 2-year-old boy had stopped breathing and was turning blue.
Advanced paramedic Geoff Flaus, 57, and another ambulance officer, 35, responded, heading out into the Manawatu night.
But it ended badly - and violently - for those who answered the call for help.
For Mr Flaus, who is on the executive of the New Zealand Ambulance Association union, it's a common tale. Three times this year he has attended callouts where he or other staff have been assaulted.
The father, Daniel Munro, 39, carried his son out to the ambulance. "Then," said Mr Flaus, "he just went nuts."