瑜伽論記 7.32

7.32

若唯依身而息轉等者，此中意難非唯依身而息得轉，如入無心定等時，身在下界而彼息不轉，故非唯依身而息得轉。

Regarding 'if the breath were to circulate relying only on the body', etc.: the meaning of the objection here is that breath cannot circulate relying only on the body, just as when entering mindless absorptions and so forth, the body remains in the lower realm yet those breaths do not circulate; therefore it does not circulate relying only on the body.