। ॥
In plain words
This second sheath is made of breath — a specialized form of air, fenced off inside the body. How could that be the ātman? Hunger and thirst press on it, and it hurts.
Close to the Sanskrit
This sheath, made of prāṇa, is a particular modification of air, delimited within the body. How could Self-hood belong to this, which undergoes pain by hunger and thirst?