Capricorn is a cardinal sign. Hence there would be friction between this natives and the other cardinal members like Aries, cancer and Libra when Mercury turns retrograde in the house of Capricorn. People seem to think more introspectively. Ambitions are likely to take the back seat during this phase of Mercury. Organizational errors are also to be expected during this period. There would be a war of sorts between the brain and the mind during this time.