Kolkata, May 1 -- Ousmane Dembele's goal separates the sides so Arsenal will not stop believing. Against a team that is possibly the best in Europe now, Arsenal had their moments and, by Luis Enrique's admission, Paris St-Germain (PSG) needed a "titan" in goal. Equally, Arsenal will acknowledge that PSG could have trebled the margin and how polished they were in the opening 30 minutes of this Champions League semi-final. So slick, so full of Parisian finesse was PSG that their supporters could light flares by the fourth minute. Dembele's shinned volley was the 26th touch by a PSG player, the most for the team in the Champions League since 2003-04. When Khvicha Kvaratskhelia found Dembele, after the latter had easily motored down the middle,...