[ Spike was never one to mingle with the other Sunnydalians and Anya, who he doesn't know a thing about, is unfortunately even lower ranked than Dawn and Xander. He doesn't know how to play her. Doesn't know how to get information out of her like he did Dawn and right now, he's all too happy to keep a distance, lest she ruins his nefarious plans.
Of course, the dome is small and paths cross. He does a good enough job to pretend like he doesn't see her as he passes, black coat swishing around his legs. ]