The young midfielder scored from inside his own half with one touch after Enrique had pulled a goal back for Villarreal to make the score 2-1.
Hernandez fired a shot from well behind the halfway line which went over the goalkeeper and into the net.
Seemingly every one of his team-mates joined him in the celebrations, which soon led to greater ones at Barça's kids celebrated a ninth Promises tournament win after seeing off the Yellow Submarine 3-1.
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