In the midst of the living creatures was the appearance of glowing coals of fire, or of torches. Fire moved back and forth between the living creatures; it was bright, and lightning flashed out of it.
KJV
As for the likeness of the living creatures, their appearance [was] like burning coals of fire, [and] like the appearance of lamps: it went up and down among the living creatures; and the fire was bright, and out of the fire went forth lightning.
ASV
As for the likeness of the living creatures, their appearance was like burning coals of fire, like the appearance of torches: the fire went up and down among the living creatures; and the fire was bright, and out of the fire went forth lightning.