Lizardman Lord was one of the tougher monsters in the game, but even he wasn’t enough to fend off a warrior as skilled as Kirito. Kirito’s Dual Blades ability is pretty overpowered and it allows him to simply overwhelm his opponents with pure speed and power. It’s just really hard to compete with that level of aggression and Lizardman’s just limited in his abilities. He can’t ascend to Kirito’s level without a major power up. Kirito wins.