SWANSEA, WALES - JANUARY 13: Saracens player Billy Vunipola on the charge during the European Rugby Champions Cup match between Ospreys and Saracens at Liberty Stadium on January 13, 2018 in Swansea, Wales. (Photo by Stu Forster/Getty Images)
SWANSEA, WALES - JANUARY 13: Saracens player Billy Vunipola on the charge during the European Rugby Champions Cup match between Ospreys and Saracens at Liberty Stadium on January 13, 2018 in Swansea, Wales. (Photo by Stu Forster/Getty Images)