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There was a moment during Tottenham Hotspur's open training session in the Seoul World Cup Stadium when the 6,000 Korean fans suddenly fell eerily silent.
They had just watched their national hero Son Heung-min collapse to the floor at the edge of the pitch, appearing to be in real discomfort as he rolled over on to his side and stayed there. Eventually he was hauled back to his feet by Harry Kane, who himself had only minutes earlier suffered a similar collapse and thrown up on the touchline before needing a cold towel pressed against the back of his neck.
