If you haven't figured it out already, one of those sides will (should) be a trigger to shoot blue particles in the event of a human win and the other to shoot red in the event of an alien win. You'll only need one if your event is a button press.
When you figure it out, you should post a
Soubok-esque diagram for all of us
lazy people particle rookies.
[img]http://sites.google.com/site/soubok2/toggelable_doors-full.jpg{/img]