Warrior General Games

On Defense, there are two zone colors - blue and gold. I've always assumed that the blue ones are pass and gold ones involve some kind of read. The spy just watches the QB, but what triggers the Robber/Lurker? Does the Lurker work the same as the Robber, and is it based on Man Awareness, Zone Awareness or some other skill?

I always just assumed yellow means an underneath zone. So that SA that needs underneath coverage can fire, other than that I think it acts like any other zone.