Pep Guardiola was blown away by two players in particular in the win over Luton Town. Manchester City returned to FA Cup action against their Premier League rivals and ran out emphatic 6-2 winners. That sees them move to the quarter-finals and keeps the chances of a successive treble high. City are just one point behind Premier League leaders Liverpool and have one foot in the Champions League quarter-finals with a 3-1 advantage over FC Copenhagen after the last 16 first leg. Pep Guardiola has maintained it’s impossible to win back-to-back trebles but City are certainly looking like they could…