He must be the fastest runner in the World, or the pitch is traveling 10 mph.
If the pitcher doesn't start his move to the plate before the runner crosses home, the run scores. Otherwise, think of it as the batter never reached 1B safely.
Another way to think about this is in the context of a little more frequent situation. Runner steals 2nd and reaches the base before the hitter fouls off the pitch. Can you imagine the runner not being sent back to 1st.
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