俱舍論記 2.177

2.177

「又離極微至此亦應爾」者，此即破前第二說。若和合色許相觸者，然離極微無和合色，和合相觸即觸極微。如和合變礙，於和合中一一極微亦名變礙。汝立相觸，亦同此理。和合名觸，於和合中極微相望應亦相觸，故言如可變礙此亦應爾。

Regarding the passage from "Furthermore, apart from atoms" up to "so too would this be the case here": this refutes the previous second explanation. If aggregated matter is accepted as touching, yet apart from atoms there is no aggregated matter, then the touching of the aggregate is simply the touching of the atoms. Just as when an aggregate is modifiable and obstructive, each individual atom within the aggregate is also termed modifiable and obstructive. The touching you posit is likewise based on this principle. An aggregate is called touching; between the atoms within the aggregate, they should likewise touch one another. Hence it says: "Just as with being modifiable and obstructive, so too would this be the case here."