Batter Interference?

[WestMichBlue]

R1 on 1B is stealing on the pitch. Batter squares to bunt; pitch is a called strike. As catcher attempts to throw to 2B, batter pulls bat back and strikes catcher, throwing off her throw. R1 is then safe at 2B. Catcher claims interference.

a) You say no, that interference has to be intentional and you felt that the batters movement was natural.
b) You agree and call the batter out and send R1 back to 1B.

Is your answer different for ASA and NFHS?

WMB