You could just have the third wheel be able to look at the choices each player made and be able to ask one player "ARE YOU SURE?" if they don't like the answer given. That player may give another answer.
Of course, the third player has their own Destiny cards they're going for, so it may not be in the player's best interest to listen to their annoying friend.
Now the real trouble would be finding a way to finish the game without punching that guy...
Haha that might actually work