umm You should not be indicating before an intersection when you planning on going straight through it. What do you expect? Indicate after the intersection.
I take it you missed the '5m' part. Possibly enough distance to complete the motion of turning on the indicator, definitely not enough for more than a blink.
I honesty can't believe there is an intersection in NZ with a turnoff 5meters after the intersection ...
Regardless. You cannot enter an intersection, with your indicator flashing and then go straight and just expect others to know what you doing. I would have put on my indicator when I was halfway across.