Can't blame only plank drivers, I'm afraid.
My near miss story involved another R22 driver about four years ago. I was involved in an aero club "Air Race", actually more of a rally with Nav Ex and questions about features on the way.
Safety breifing prior stated clearly "No orbitting on track, if you miss an answer don't go round. They aren't worth the risk etc etc."
At one feature (a cattle station airstrip) question was something about the number of cattle yards at one end of the strip.
Gave an " All Stations" call as we approached, no answer - We came down to about 500 ft AGL running down the strip. Out of corner of eye a shadow appears on ground, small and coming toward us. I look around and see a large hawk off to the sun side. In the instant that my brain used to be able to work I crunched the thought, "It's OK the shadow is the hawk and he's out of the way" Followed by "Hang on the the shadow is coming toward us and the hawk isn't where the shadow suggests it should be."
Bank left, as another R22 (one of the other contestants) passes us about single digit rotor distances at the same altitude going th eopposite way, on our right.
Going the "wrong way" to get a recount of the stockyard numbers.
Boy was I unimpressed about that!