[ATannahill]

Can someone help me understand some things about defenses?

Am I correct in believing that when the audience selects the defense, the same defense is used on both sides?

When alliances make their selections for the other slots (2,4-5), is it possible for them to select the same defenses as their opponents, i.e. can both alliances choose the Rough Terrain for Category D? I could not find anything that prevents this.