What you can do is when -force is typed, make 2 ITE (If, Then, Else). First ITE, check if triggering player or whoever types it belongs to Force 1 then make all Players in Force 1 treat treat triggering player as enemy and make all Players in Force 2 treat triggering player ally. Second ITE is the same, but in If, check if triggering belongs to Force 2 then put in Then, Treat Players in Force 2 enemy with the triggering player and treat Players in Force 1 ally with Triggering player.