What to make of this quote?
so vivicceva kāmehi… (whole 4 jhanas pericope) … catutthaṃ jhānaṃ upasampajja viharāmi. so ce ahaṃ, brāhmaṇa, evaṃbhūto caṅkamāmi, dibbo me eso tasmiṃ samaye caṅkamo hoti.
secluded from sensual pleasures … fourth jhāna… Then, brahmin, when I am in such a state, if I walk back and forth, on that occasion my walking back and forth is celestial.
Bhikkhu Bodhi notes:
Mp says that his walking back and forth is celestial when, having entered the four jhānas, he walks back and forth; and his walking back and forth is celestial when, after emerging from the four jhānas, he walks back and forth. This seems to imply that walking can occur even with the mind in jhāna. This, however, is contradicted by the dominant understanding that jhāna is a state of uninterrupted absorption in an object, in which case intentional movements like walking would not be possible. Mp-ṭ explains the first case of Mp (walking after entering the jhānas) to mean that he walks back and forth immediately after emerging from the jhāna, while the second case (walking after emerging) to mean that he walks back and forth after having emerged some time earlier.