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In contrast, no immediate evidence is available concerning the magnified Fe magnetic moments or the increased spin-density wave (SDW) gap. To analyze the dynamics of BaFe2As2 in its A1g phonon-driven state, we leverage time-resolved broadband terahertz spectroscopy. Early-time delays below the SDW transition temperature are associated with a temporary gap formation. The normal state displays a comparable, transient characteristic, up to room temperature. After