There is still this. The impact was so perfect it is hard to claim bad luck. - the chance of the planes getting close and causing worry are pretty good. - the chance of the helicopter having to need to evade are so-so - the chance of the airplane needing to maneuver aggressively to avoid collision are pretty slim - the chance of a perfect collision such as we're shown, that seems remote. I'm not swallowing the wrong place at the wrong time argument fully. It was a perfect 3D path interception. Try to calculate a point where a circular descending path intersects a line, and you have a fraction of a second to get both objects to that point in real world conditions. It seems the opportunity for such a crash is vanishingly small. Too small for bad luck.