A fire of coals (anthrakian). Old word, in lxx, only here and Joh 21:9 in N.T. A heap of burning coals (anthrax, coal). Cf. our “anthracite.” It was cold (psuchos ēn). “There was coldness.” The soldiers had apparently returned to their barracks.
Were warming themselves (ethermainonto). Direct middle imperfect indicative of thermainō (from thermos). So as to thermainomenos about Peter. “Peter, unabashed by his lie, joined himself to the group and stood in the light of the fire” (Dods).