That is the typical thing people do when a bird attacks, they want to get down and away. Unfortunately, that is worst thing you could do because one thing these attack birds are masters at, is hitting a target below them and flying away. They always attack other birds from above because they have the speed and maneuverability on their side. Your bird may have been a hawk or possibly a golden eagle, if it was big and brown, if you have them in NZ.
The one thing all attack birds are no good at is flying upwards/climbing, so once you see a bird trying to attack ALWAYS go straight up and they will not be able to catch you. Once at altitude you can then fly away and come back to yourself from a distance and hopefully the bird will have lost interest in you. Sorry for your loss.
I would strongly suggest you call DJI and have them replace your drone, if you have care refresh. You will get a brand new one, not a repaired unit, that may have other ongoing issues surface, later on. Plus, DJI are very fast with their turnarounds, and they pay shipping to them and back to you. I've been through that, trying to get independent repairers to do the work and it never got properly fixed but cost me money. In the end I used DJI and had to pay because I had no warranty with them, but they sent a new drone in a week.