For my radio license practical test in the sim I was tested on just such a scenario which although unscripted was entirely necessary since a few years later I operated as relay for the real thing with a successful outcome. My initial relay was subsequently taken over by a B727 orbiting at high altitude while I headed for home after being stood down.
Someone was lost over the desert as night descended but fortunately he walked away.
I expect it is still practiced in the sim as standard?