Mate, I felt it so hard I thought someone had left a window open - except there are no windows back there. That spot has been reported consistently for years, it's not a one-off thing. I've done enough investigations to know the difference between a draught and whatever that was, and that was not a draught.
What gets me is how localised it is. You take two steps left and it's gone completely. Two steps right, gone again. That kind of thermal anomaly in a sealed corridor doesn't happen naturally, or at least I've never seen a satisfying explanation for why it would.
Anyone bring a thermal cam on their visit? Would love to see actual footage of teh temperature gradient in that area rather than just relying on personal accounts, even though those accounts are pretty consistent across different groups. What floor were you on when you felt it?