Sure enough, the Demon's tail whipped around the Great Sword like a lash. Had it not been for the enhanced physical strength from Foundation Establishment, Lancelot, fully clad in plate armor, would've been plucked out of the ground like a turnip, and that strike would have definitely hit him squarely.
But Ulgog had no intention of letting him off so easily. The Demon's tail coiled around the blade of Glacier and with a fierce pull backward, aimed to disarm the Human Knight in the process.
Generally, such massive weapons were not sharp-edged, and even if they were edged, they would not be exceptionally sharp. This allowed knights with metal gauntlets to grip the blade directly, using the Great Sword more as a tool to leverage against their enemies. The Domineering Demon was very confident in the strength of its tail, hence its direct attempt to disarm its opponent.