Position change.
Example setting says, try engage distance 1000, then in Game settings, set player 1 engage 500. player 1 would be halfway towards uke, then uke would be in the same place.
Or, engage distance 1000, set player 1 500, set player 2 -200, player 1 can be in the middle, while uke is 200 sets backward of 1000.
Can be useful for fun mods.