The Joys of Overzealous Moderators

[Executor]

Apparently, users get banned with no reason or explanation what so ever around here. Or so one (or at least I) would believe?
I'm talking about Calahan here, who just got banned, permanently.

Would any of our glorious mods mind shedding some light on the matter and explaining to us, mere mortals who apparently do not understand the ways of Shrapnel, what the heck just happened?
Of course, I'm just asking out of pure selfishness and self preservation as from what I see Calahan didn't post anything rude, offensive, inflammatory, etc, or pretty much anything at all in the last month or so and still got banned.