This depends on what rules you are playing.....
Under NFHS rules this is batter interference and the batter is called out...
NFHS rule 7.3.5f 8.4.1h
If a batter's follow through hinders a catcher attempting to field a ball, the batter is guilty of interference.
Penalty: the ball is dead, Batter is out and runners remain at bases @TOI (time of interference)
Under NCAA or OBR.... Ruling is dead ball, strike, no interference and runners return.