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GLOUCESTER, ENGLAND - SEPTEMBER 23: Amanaki Mafi of Japan leaves the field on a stretcher during the 2015 Rugby World Cup Pool B match between Scotland and Japan at Kingsholm Stadium on September 23, 2015 in Gloucester, United Kingdom. (Photo by Julian Finney/Getty Images)

GLOUCESTER, ENGLAND - SEPTEMBER 23: Amanaki Mafi of Japan leaves the field on a stretcher during the 2015 Rugby World Cup Pool B match between Scotland and Japan at Kingsholm Stadium on September 23, 2015 in Gloucester, United Kingdom.  (Photo by Julian Finney/Getty Images)