Reference for Chullin 104:53

מכל מקום לרב חסדא קשיא

For it was taught: Beribbi said: Only in that case when there was some one present to save [the attacked animal] did the Rabbis say that the clawing [by a cat] was of consequence, but when no one was present to save [the attacked animal] the clawing by a cat is of no consequence.

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