Direct Answer
The transcript provided is truncated before Bercot finishes his explanation of “sacrifice,” “altar,” and what he means by “remembrance/anamnesis,” so we can’t quote his full argument on “reparticipation.” Still, based on what he does say, treating communion as real participation would call for greater reverence, repentance, and expectancy of spiritual benefit, while fears likely come from association with Roman Catholic “Mass” abuses and the idea of re-sacrificing Christ.
Support from Transcript:
Which fear is stronger for you: drifting into superstition, or drifting into casualness? How would your self-examination change if you believed communion truly communicates grace and has consequences when received unworthily?