After his fight with Challia Bull, Amuro realizes the Gundam's hitting its limits—the mobile suit can't keep up with his reflexes anymore without overheating. When White Base reaches Solomon, Mosk Han shows up with a solution: a magnetic coating that'll fix the heat issue. It works, and the Gundam's back to operating smoothly. Mosk's not doing it out of the goodness of his heart though—he asks Amuro to hand over battle data from his next engagement as payment.
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