No, interloper comment was a joke. Met the young lad who had bought a 2nd hand Spark and was trying it out nearby. With his permission and cooperation, we sent both drones up, not too high, to have a look at each other. Just a bit of fun.Interesting and I have always thought that might be entertaining BUT unless you knew the pilot and were in communication with them I think you took a heck of a risk at 19sec. I am half assuming this was a coordinated flight but....
If you were not in communication with them you do not know how they would respond to your approach.
A while back I had a looksee at what turned out to be a kite but I stayed well back from the kite.