You know the last time I saw a Hiller mustering Brumbies, it was jammed in the air filter of my 3B-1.
had exactly the same experience, having a very hard time one late afternoon right on about thirty years ago, amongst a sea of twenty foot high pea bush when it wasn't in the channels and cane grass, heard a noise, out of nowhere i spotted a cone shaped piece of corrugated iron disappearing toward my air cleaner.
probably the same little chappie that you had, running around picking up rocks he was, he must have seen the light, he is currently flying with angels I believe. more than likely he will come on here and try to give a bit of lip