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obviously she was just trying to cover her mouth when coughing... and i think it's polite to do so when you're sitting in a bus/metro (to avoid transmitting germs to others). there's really nothing special... if you find this interesting, you probably have a boring life, seriously.
ahh yes, anonymous, you'd know, wouldn't you? i mean, i was just riding the train with her, observing her for 15 minutes, but you're definitely more qualified to decide whose life is boring.