As to if it's safer to send home or remain with pilot... obviously if you send it home, then it was decided - safer to send it home.
As to how it gets home, that's up to HTC... most of it is already programmed...
Consider how to make them land - come in slow, flaps down, drop gear... the two drones land on their own
So just need to extend the distance to final, maybe a last turn at most?
Wondering what happens if we come in perpendicular to a runway, drop flaps, lower gear...
and uh, there are never guarantees!