If that happened in the Parking Lot thread, I wouldn't have a problem with it. Anywhere else and I would. But then you get into the shades of gray when talking about what I'd do about it. If it was sudden and obviously unprovoked, I'm going to be a bit tougher about it with the one person. If it's an argument that was escalating on both sides and reached that point, I'd likely only warn both.
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