Police are hunting two attackers responsible for landing the so-called coward punches, which occurred within minutes of each other earlier this month.
Video of the one-punch assaults that happened within minutes of each other in Auckland have been released.
Three people were knocked out from single punches on July 2, and police are seeking information on the cowardly attackers in the footage.
Officers leading the investigation have a clear message - just one punch can have a life-changing impact.
Boxing commentator and former professional boxer Mike Angove spoke to Mark Sainsbury, filling in for Paul Henry, about how lethal can one punch be.