What's your opinion?

[Illinois blue]

I see a lot of threads saying that if the ball hits the bat, play on. But, if the bat hits the ball, dead ball interference. I bought a book written by the NFHS Officials Education Program. The book is called Officiating Softball sponsored by NFHS. This book says it doesn't matter which does which, the only determination is where the ball is when the fielder touches it(fair or foul). It's on page 50 if anyone else has bought this book. So, what do you guys and gals think now?