Roger,
The rule that you are looking for is 7.3.6. The one minor point of controversy is whether "dropping" the bat is the same as "throwing" the bat. The one casebook play talks about a bat slipping from a batter's hands and interfering with F5, but I think the ruling justification applies equally well in this case also, it states: B1 is declared out because B1 is responsible for controlling her bat and not letting it intefere with a defensive player attempting to make a play.
SamC
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