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Remus was hit by a dark curse that knocked him right out and made him appear dead. Dig was about to call time of death when he noticed something that made him realise Remus wasn't actually dead. Remus had the usual cuts and scrapes from a battle that involved collapsing buildings and flying debris and these were easily healed, but with the dark curse, it would take time for it to lift and only then would they be able to see the true extent of Remus' head injury.