He kept one eye on Klausner, who was standing completely still with the axe in his hands, watching him.
그는 손에 도끼를 들고 완전히 가만히 서서 그를 바라보고 있는 Klausner를 한쪽 눈으로 주시했습니다.
completely still 꼼짝하지않고 서있는 (미동조차 없는)
ex) Is it possible for humans to stay completely still?