This cloud that went between the children of Israel and the Egyptians was darkness to the Egyptians and light to the children of Israel.
Exodus 14:19-20 And the angel of God, which went before the camp of Israel, removed and went behind them; and the pillar of the cloud went from before their face, and stood behind them: And it came between the camp of the Egyptians and the camp of Israel; and it was a cloud and darkness to them, but it gave light by night to these: so that the one came not near the other all the night.
A Two Sided Cloud
This cloud that went between the children of Israel and the Egyptians was darkness to the Egyptians and light to the children of Israel. The cloud also provided separation between the Egyptians and Israelites. The Lord can be two things at once to a lost and dying world. He can be a savor of life unto life to the Christians and a savor of death unto death to the lost. Even any physical blessing that the lost get is just likely pushing them farther from the Lord. The same Bible that is light unto the Christian is a thing violently hated by atheists trying to get rid of it out of the public circle. The cloud lead the children of Israel through the desert for many years to come. To the Eyptians is was just a fog that was getting in their way of trying to kill the Jews. However, in the end it was the same cloud that they both saw. The differences was the perspective. The back was dark and something preventing forward progress. From the front it was light and separation from the world.