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GLASGOW, SCOTLAND - OCTOBER 14: Billy Vunipola of Saracens, looks on with an ice pack on his broken left arm, looks on after being replaced during the Champions Cup match between Glasgow Warriors and Saracens at the Scotstoun Stadium on October 14, 2018 in Glasgow, United Kingdom. (Photo by David Rogers/Getty Images)

GLASGOW, SCOTLAND - OCTOBER 14:  Billy Vunipola of Saracens, looks on with an ice pack on his broken left arm, looks on after being replaced during the Champions Cup match between Glasgow Warriors and Saracens at the Scotstoun Stadium on October 14, 2018 in Glasgow, United Kingdom.  (Photo by David Rogers/Getty Images)