Been taken over?

I asked my instructor on the weekend what a pilot is expected to do, should
he come across a downed plane, or was in the vicinity on another plane that
was going down, or making a forced landing.
He said that you should tune to the relevant ATC frequency, and inform them
of what has/is happening, and where you are. He then said that the head
controller would come on the radio and inform you he is taking control of
your aircraft, and instruct you to remain in the area. He said you are not
to leave the area unless you are running low on fuel yourself. He said that
the controller would dispatch a helicopter to the area to land near the
wreck/downed a/c. He also said that you would be paid for your time whilst
you are holding position.
My instructor said this exact scenario happened to him once.
Anyone else had a similar experience?
Crash Lander

--
I'm not always right,
But I'm never wrong!