Possible meanings are 1) "they" refers to people in general who are in Egypt or 2) "they" refers to the foreign soldiers who are fleeing to their native lands of Cush, Put, and Lud.
# Pharaoh the king of Egypt is only a noise, one who has let his opportunity slip away
These two phrases are saying that the nation of Egypt has become of little importance. The phrase "only a noise" is an idiom that means a person says he will do something but he does not do it. Alternate translation: "Pharaoh brags much but cannot do what he brags he will" (See: [[rc://en/ta/man/translate/figs-idiom]])
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