v. 18 — Now the servants and the officers were standing there, having made a fire of coals; for…

Peter, having passed inside the door, and finding himself encircled by the servants, affects to do what they do (though bowed down with grief and with an intolerable burden of agony at heart), that he might not be convicted by his despondent and sorrowful countenance of feeling sympathy with the Man Who was on trial, and be cast out from the doors which contained all he loved. For it is quite incredible that the disciple should have been so carnally minded as to seek out a means of appeasing the chill of winter, when he was thus heavy with grief. For if he might have enjoyed greater luxuries than this, he could not have borne to do so while Christ was thus afflicted. He intentionally models his behaviour on the apathy of the attendants, and, as though he had no inducement to despondency, shakes off the chill of winter, in order that he might create the belief that he was one of the inmates of the house, and might thus for the future escape answering any further questions with a denial. But the word of the Saviour could not be falsified; for He foretold to the disciple what He, as God, knew would certainly happen.

CyrJn 11.18.1