Alright let me just say Fallout Shelter is one of my favorite mobile games I play it almost every chance I get and as I was playing I got an idea what if slavers showed up at your vault (group of 3-7 with all different kinds of guns) and tried to kidnap your dwellers and if one of them kidnaps your dweller and drags them out into the wasteland you can send your other dwellers out in the wasteland to save them. Their success on saving them depends on their stats like strength and agility and their level.
I don't know tell me what you guys think in the comments below