Werner received the ball on the left, with space opening ahead of him, and the German needed little encouragement.
Taking a touch into his stride, the former Chelsea man accelerated down the wing, leaving his marker struggling to keep pace.
By the time he approached the edge of the penalty area, he had enough room to look up and drive a low cross across the face of goal.
The ball flashed through the six-yard box at considerable speed.
Son had made a run towards the near post, but he was a fraction too late.
Nobody had followed Werner's delivery into the space beyond him, and the ball continued untouched before running out on the opposite side.
"That's a dangerous ball from Werner!" the commentator exclaimed.
"He had the pace to get away, and the delivery was right across the face of goal. Tottenham had bodies moving forward, but nobody was there to finish it."
His partner gave a brief laugh.
