For the source text click/tap here: Chullin 86
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"It occurred that Rav Beruna and Rav Ḥananel, the students of Rav, were sitting together at a meal, and Rav Yeiva the Elder stood over them to serve them. They said to him: Give us a cup of wine over which to recite the blessings of Grace after Meals. They thenchanged their mind and said to him: Give us a cup of wine to drink. Rav Yeiva the Elder said to them that this is what Rav said: Once someone at a meal says: Give me a cup over which to recite the blessings of Grace after Meals, it is prohibited for him to drink any more wine, since he has expressed his desire to conclude his meal. If he now wishes to drink more wine, he must recite a blessing before drinking it. Ravina asks: Here too, since he is required to cover the blood of the undomesticated animal before slaughtering the bird, there is an interruption between the acts of slaughter, and he has therefore become obligated torecite a new blessing before slaughtering the bird.”
We explore the notion of hefsek as a halachic and possible theological category with reference to object indexed versus intended index theory.