Alliance/enemy help please!

[MicroSheep]

Okay so iv made a trigger so that when a random player is picked, he/she recieves a unit, but i want to make it so that the player picked becomes an enemy to the rest of the players. How do i do that?

 

[Schyy]

iam not sure if there is a better solution in GUI but i would do it with 2 player groups

Untitled Trigger 001
    Events
    Conditions
    Actions
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
            If - Conditions
                ((Picked player) is an ally of (Random player from Group1)) Equal to True
            Then - Actions
                Player Group - Remove (Picked player) from Group1
                Player Group - Add (Picked player) to Group2
                Player Group - Make Group1 treat Group2 as an Enemy
                Player Group - Make Group2 treat Group1 as an Enemy
            Else - Actions