Runner on 1st.
Batter thinks he has a 3-1 count. Next pitch is a ball and the batter trots to 1st, R1 trots to 2nd.
After the batter reaches 1st, defensive coach asks for time and says he had the count as 2-1 on the pitch not 3-1.
Umpires confer and agree the pitch was ball 3 not ball 4 and call the batter back to the box. Then tell the runner at 2nd to return to 1st.
Our coach argued that the runner should remain on 2nd, because he took the base while the ball was live. Umpires said it was a dead ball situation and he had to return.
What say the experts?