Trailing 2-0 at the break and all at sea at the Estadio de la Ceramica on Tuesday evening, Liverpool boss Jurgen Klopp summoned Luis Diaz from the bench in a bid to lift his side.
Villarreal's dream first 45 minutes, inside a cauldron of noise on home turf for the Yellow Submarine, had Unai Emery's men looking like they would be the ones to make the Champions League final in Paris later this month.
They had Liverpool on the ropes and the concerning nature of the Reds' performance in that first half had plenty fearing the very worst.
