Throw from F2 hits batter's bat on backswing - Call?

[CecilOne]

I am still finding I a bit ambiguous about the swing follow through hitting ball or catcher being INT and any natural part of the swing not being INT.

"In USA Softball, Rule 7-4-I and Rule Supplement 24 says that if a batter swings and misses the pitch, and then on his/her follow-through hits the ball, or hits the ball after it bounces off the catcher or his/her mitt, then the ball is dead and runners cannot advance. "

AND

"So a normal hitting action and a normal follow thru are not interference"