Only goes to show that you cannot assume that everyone else is listening to your position reports. I work on the basis that if I am in an unusual location/at an unusual altitude, sod's law means that there will be someone else doing exactly the same thing in other direction.
This demonstrates how alert you have to be at low level - it is too easy to be distracted by the boats/ cattle pens/ photo shoot and forget to look where you are going and whether some one got there first.