Hi Pete,
Either you misunderstood what I meant or I didn't make it clear.
What I meant was after contacting the plane on 121.5, then switch to another aircraft channel that is used for general chat between pilots and conclude your business with the pilot on that channel. And then I said to advise the pilot what frequency (aircraft) you would be standing by on so you could talk with the rescue chopper. These frequencys are on the AM band and your frequencys are on the FM band.
Does that clear things up?

Thanks for your input.