Liverpool needed to answer back on Thursday evening with only a win against Sheffield United being enough to take them back to the top of the Premier League. In truth, Liverpool couldn’t have asked for a kinder fixture in which to reassert their dominance. The Blades were rock bottom of the table heading to Anfield tonight. The Reds didn’t start in the best fashion. Only a top save from Caoimhin Kelleher prevented them from going behind inside a minute. But from there, Liverpool grew into the game. Pushing on with wave after wave of attack, it felt like only a matter of time before they would …