It was Firmino who led Liverpool's second-half fightback after they found themselves 2-1 down at the interval, using his clever and relentless movement to unsettle Watford's back four as well as being the man who directly contributed to the two goals the visitors scored in that period - playing the pass that led to the 55th-minute penalty, which he scored himself, as well as the lofted cross-cum-shot that Mohamed Salah converted to make it 3-2 shortly after.