LONDON (Reuters) – The UFC returned to London on Saturday but it was two Liverpool fighters who stole the show, as Paddy Pimblett and Molly McCann pulled off brilliant wins to electrify the crowd at the O2 Arena in the capital for the first time in three years. McCann blazed forward from the opening bell against Brazil’s Luana Carolina and ended the fight in spectacular fashion in the third round with a spinning elbow that knocked her opponent out cold. Not to be outdone, her close friend Pimblett bounced back from being rocked by an early punch to dominate Mexico’s Kazula Vargas, taking his o…