Comp wrote:11.15.3 The batter may not swing and miss a pitched ball and then accidentally hit
it on the follow-through or after it bounces off the catcher or her glove/mitt.
EFFECT—The ball is dead. The pitch is a strike. The batter is declared out if
the pitch was a third strike; otherwise, she remains at bat. Each
base runner must return to the base legally occupied at the time
of the pitch.
This is the correct ruling regarding the posted question.
I just wanted to take a second and expand it, should a slightly different play happen.
If the batter strikes out and interferes with the catcher's attempt to throw out a base runner, the base runner also is out. The ball is dead. Rule 11.24.18.Effect.Exception.2