Arcana Coelestia # 4935
4935. When made visible that bare arm is bent in varying attitudes that strike terror. When seen bent in the attitude mentioned above it strikes unbelievable terror, since it seems to be able to break bones and marrow to pieces instantaneously. Those who during their lifetime have been afraid of nothing are nevertheless in the next life driven by that arm to feel utterly terrified by it.
Turn
If we turn ourselves toward the Lord, we can get the full inflowing of His wisdom and love; if we turn away from Him we cast ourselves into cold and shadow -- we turn ourselves toward hell. In the Bible, "turning" generally refers to a change in spiritual state, as people turn themselves toward the Lord or away from the Lord.