More on Batter Interference

[rbmartin]

Originally Posted by mbyron

If the batter remains in the box and makes no abnormal movements, he is immune to BI, no matter where F2 throws the ball.

+1 (unless R3 is coming home)
I would define "abnormal movements" as any movement not related to or in conjunction with a legitimate swing.

Originally Posted by mbyron

If he steps out or makes abnormal movements, and if he consequently hinders the defense, it is BI.

+1
Most "abnormal movements" I would be looking out for would be intentional in nature. I suppose there might be some unintentional ones but they are very infrequent.

Originally Posted by mbyron

It's not that difficult in practice.

It's not difficult for me to call. Sometimes it is very difficult to explain it to some hothead coach who's kid you just called out.