"What the hell is FN?"
Suddenly, it makes sense. His confusion, the wounds on his head. He probably lost his memory.
English
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"Mhm, you lost your memory"
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He looks around, "Well, no shit Sherlock."
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"Hey man, I wouldn't be talking shit if I were you"
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"Why not? I didn't talk shit to the bar, yet it did me a number. Might as well get some satisfaction out of it."