Sounds interesting, but you can practically achieve the same effect by other means, like throwing knives. I am not sure how many folks would subdue NPCs and “use” them to kill targets, costing unnecessary NPC accident kills in the process.
It’s a different story if we are talking about using targets on others targets, but then the levels have to be designed to make sense for the targets to be close to each other. I don’t know if players would be up to moving a target from one end of the map to the other end just to kill another target. This could become a disused game mechanic down the line.