Answer: That is an
interesting question. I assume it is a hypothetical situation, not an
actual occurrence. In any event it deserves an answer.
So I checked with the official baseball
rule book and found this sentence which appears to address the issue:
Rule 6.08 c. If the catcher interferes
with the batter before the pitcher delivers the ball, it shall not be
considered interference on the batter under Rule 6.08 (c). In such cases,
the umpire shall call "Time" and the
pitcher and batter start over from "scratch."
Since contact of the bat with the catcher's
glove took place before the pitcher delivered the ball, this should
not be considered interference. Assuming, of course, the umpire was aware
of the contact prior to the pitch, the umpire should call time out.
If I were the umpire in this situation and
I saw the contact I would call time out and rule no pitch.