I think these two exist in ambiguity so there is no cop out: it's one of their moments of complicity. I can't see the relationship being any more than moments. That's probably your fault; they come together in a case or an ending, but there can be no settling into routine. That would reduce them somehow into ordinary people, which neither of them is. Hope that's not to thinky for a Friday but your question prompted it. Stalemate did feel more satisfying, though I'm pleased she came back. Booth would settle for that.