Season 1 Question about Lou and Lorne [Spoiler…

I just finished season one. As Lou would say I just can’t make my way clear to it (this scene). When they are talking in the diner, Lundy out of nowhere and quite jarringly blurts out “Had a case once..” and proceeds to give vague details on the 1979 case to an otherwise uncaring Billy Bob. Was he just trying to change the topic? Was he feeling him out? It’s one of the few scenes I’m left unhappy with since that whole thing was outta context. Maybe they had no other way of giving us a hint about S2?

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