March 13th 2017, Stamford Bridge, Chelsea, London England; FA Cup 6th round football, Chelsea versus Manchester United; Referee Michael Oliver trying to calm the situation as he looks towards his linemen with Phil Jones of Manchester United, Chris Smalling of Manchester United, Luis Antonio Valencia of Manchester United, Marcos Rojo of Manchester United, Goalkeeper David De Gea of Manchester United and Diego Costa of Chelsea  (Photo by John Patrick Fletcher/Action Plus via Getty Images)