Jiang Chenchou's attack was certainly not ineffective. However, at that moment, when Pretty Girl retracted the Asura God's Sword, the shadowy sword beam was what truly mattered.
The physical form of the Asura God's Sword now relies on the existence of the Shadow Demon Sword. Essentially, it is still the Shadow Demon Sword, except that the sword beam is that of the Asura God's Sword. If it had been the super divine weapon Asura God's Sword here, could the Immortal Golden Body have possibly withstood it?
Therefore, when employing the Asura God's Sword, the intrinsic abilities of the Shadow Demon Sword are embedded. Although it's been refined by the Asura God's Sword, some traits of the Shadow Demon Sword still persist. Among them, the most critical trait of the Shadow Demon Sword is its ability to copy.