Well...I see this happen quite a bit...Batter swings on a pitch that hits him..it is a dead ball stike.The vast majority of the time.But if the pitch strikes BOTH part of the hand and the bat at the same time and goes into play without touching any other part of the batter..you can hear the difference,the ball is in play.You then call what happens.I have had a boy break his index finger on a swing that hit both his finger and bat at the same time.He wound up on first...D coach wanted a dead ball strike called until I "SOLD" the fact that it also hit the bat.