Drone Flies Into Path of Helicopter

....hard to tell.

You have the whole range from "nothing" to "crash/death" - all depends how/where/how big/speed/initial damage.....
Yes, the rules in NZ are, unless landing - 1000' above the highest obstacle over built up areas. 500' elsewhere. For aerial work, agriculture application etc helicopters and fixed wing may fly below 500' down to a height appropriate for the job, in many cases almost ground level. Many military flights train below 500', in NZ civil airspace, clear of civil low flying areas, 250' (FW) and 100' (RW), i.e. most of the country.