Southampton manager Ralph Hasenhüttl claimed he was to responsible for the thrashing by changing the team’s defensive formation. A more reasonable judgment is that Liverpool are simply on another level, and the visitors were relieved to keep the onslaught to four goals.
“We wanted to surprise them a little bit and we surprised ourselves,” said Hasenhüttl. “That is not a good idea against a team on fire. It was my mistake. I sent them out with a plan that didn’t work. We tried it the way we tried it against Chelsea but it didn’t work. Liverpool are super hungry, super motivated and have an unbelievable flow. I think there is no team that doesn’t have problems to stop them.”

When Bednarek misread Trent Alexander-long Arnold’s ball out of defence, he allowed it to bounce over him, creating the breakthrough. Although Southampton stopped Jota’s early attempt, Andy Robertson and Sadio Mané continued to apply pressure down the left flank. With a lovely pass, Mané picked out the left-darting back’s run into the box, and the great Scotland skipper pulled back his cross for Jota to steer a finish past Alex McCarthy.
source : Guardian sport