Breaking down how Yankees were relaying to the batter when Andrés Muñoz was throwing a slider

Yankees came back from 5-0 down and being no-hit through 7 innings to win in 10 innings. In the 9th inning vs Mariners closer Andrés Muñoz, Yankees runners on second base were waving their arms when he was throwing a slider to relay to the batter. NY Post's Tommy Hogan breaks it down.