By Chris McKenna Jurgen Klopp hailed a “thunderstorm” of a second half as Liverpool ran rampant against Luton to extend their lead in the Premier League title race. And the Kop boss claimed their 2019 comeback win over Barcelona was the inspiration for the four-goal rout against the Hatters. That’s because the Reds overcame an injury crisis – just like they did in the Champions League semi-final comeback classic – to move four points clear at the top of the table. Klopp said: “The second half was a thunderstorm, wow. Wow.” Liverpool were without 11 first-team stars last night including Mohamed…