Because it was cold, the servants and officers were standing around a charcoal fire they had made to keep warm. And Peter was also standing with them, warming himself.
Textus Receptus (TR) - John 18:18 >Εἱστήκεισαν δὲ οἱ δοῦλοι καὶ οἱ ὑπηρέται ἀνθρακιὰν πεποιηκότες, ὅτι ψύχος ἦν, καὶ ἐθερμαίνοντο· ἦν δὲ μετ᾿ αὐτῶν ὁ Πέτρος ἑστὼς καὶ θερμαινόμενος.