Advice needed on "Hands part of the bat" myth

[Dave Reed]

Does this help? From the FED Casebook:

7.3.4 SITUATION B: B1 is at bat with a three-ball, two-strike count. He swings at the next pitch and the ball hits his right fist and, without contacting the bat, goes into foul territory. F2 retrieves the ball and throws to F3 who is covering first base and tags B1 with the ball. RULING: As soon as the ball hit the batter it became dead. B1 is declared out. To have the play ruled a foul ball, the ball would have to have hit the bat of B1 before it touched his hand.