Spike only smiles at that realization, still fairly good at keeping his cool. Just because this is his first mission, though, doesn't mean this is his first rodeo, and he's just not sure whether to trust her with secrets yet as much as he's enjoying their little conversation.

"I guess I should have expected someone in your position to know. Either way, I may as well be a janitor." he 'assures' her, a brow half-raised. "I'm just here to help clean up."

It's not exactly blatantly hinting at their interference, but it's like also not subtle. It's just also leaving a bit of a way out, if Rainer isn't as aware as he thinks or perhaps doesn't trust him because lbr he should not be trusted