These two phrases mean basically the same thing and emphasize the intensity of their fear. (See: [[rc://en/ta/man/translate/figs-parallelism]])
# their hearts melted
Here "hearts" refers to their courage. They were so afraid that it was as if their courage melted away like wax in a fire. AT: "they lost all their courage" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-metaphor]])
# there was no longer any spirit in them
Here "spirit" refers to their will to fight. AT: "they no longer had any will to fight" (See: [[rc://en/ta/man/translate/figs-metonymy]])
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