I am having trouble finding the ASA rule(s) on the following that happened on Saturday. Other teams batter bunted the ball. The bunted ball hit the ground in fair territory. The batter then dropped the bat in front of the batter's box fully in fair territory. Ball rolled back into bat before any fielder touched the ball. Ump calls dead ball, batter out and returns runner to 1st. Any guidance as to which rule(s) is appreciated. Thanks.