Switches your target colour/icon for the enemy team to appear friendly. You still don't appear on the map if no-one has visual. So in a one on one situation looking away from a potential saboteur they would disappear from the map. But you just turned away!

Lots of uses from light to assault. Together with seismic could aid escape. Lights could stand in with the enemy huddle lighting them up for LRM. Team will be looking for UAV and at each other. Hey guys we have 13 players!!!
Keep player original name too. So the really good players/friends will recognise the name and open fire!
Team chat voice or text could be used to issue team code ("Rubber Duck"). Enemy player won't be able to respond to team question or supply a response.
Should provide some comedy game play. Shooting team mates just to be sure!
Narc could be used to counter effect. Disabling the effect and turning the player red again.
Cheers
Codestar