How we should understand this, requires some careful consideration; for Matthew says, Peter was sitting without in the hall, which he would not have said unless the transaction relating to our Lord were passing within. Likewise also, where Mark said, And as Peter was beneath in the hall, he shews that the things he had been speaking of took place not only within but in the upper part. How then did our Lord look upon Peter? not with His bodily face, since Peter was without in the hall among those who were warming themselves, while these things were going on in the inner part of the house. Wherefore, that looking upon Peter seems to me to have been done in a divine manner. And as it was said, Look thou, and hear me, (Ps. 13:3.) and, Turn and deliver my soul, (Ps. 6:4.) so I think the expression here used, The Lord turned and looked upon Peter.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: ut sup.