Sorry, I'm just not getting PM ?
I think you are asking what to do if the drone (MP) loses all wireless input from the controller ?
If so, there is little you can do, you could / should certainly try pause, flicking sports mode, or auto land etc, to see if it works . . . but apart from ensuring before flight that the best RTH settings were thought out and set, then you hope like Billy-oh RTH works !
If it is flying away, you're screwed I guess, maybe try and follow (on foot or vehicle) it to hopefully recover somehow ?
If someone is with you to drive / follow, you could try closing app and restarting, see if wireless reconnects.
If it just hovers if set to hover in case of loss of wireless, or for whatever other reason, fingers crossed it would just auto land when the battery runs low enough.
Then hopefully you are not over anything dangerous to either people, property, or the drone itself directly below the hover point.
Please correct me if I misinterpreted your question / scenario.