Disengagement could be done like this:
1 – Select a spot to which your brother is supposed to move to (but don’t confirm).
2 – Roll to determine which enemy will get an attack of opportunity (in case there are more than 1).
3 – Highlight the ground under the enemy with a red color (ideally this should only appear if you select a spot when engaged).
4 – Show a tooltip saying what chances are for being hit if you try to disengage.
