They bossed Arsenal big time but on the occasions Arsenal got a ball in behind, they were exposed badly. Carragher hit the tickle my balls with a feather, if you're defending that high, you can't play offside the way they do. You've got to be ready to turn and defend. Their defensive line is on the halfway line so could you imagine a Son, Moura or Bale getting to charge onto a through ball when VVD, Gomez or whoever have to turn and try to catch them. And the opposition are starting their runs from their own half which means they can't be offside.
They've been very ropey at the back in the games I've seen them. With Allison out for 4-6 weeks as well, they could drop more points.