In the PSP and PS Vita game adaptations of Sword Art Online: Infinity Moment and Hollow Fragment, the Dual Blades skill has several Sword Skills that were never used/seen in the light novels, anime, or manga.Kirito said that if Konno Yuuki had played Sword Art Online, she would have received the Dual Blades skill instead of him, due to her reaction time being much faster than his.So far, he has reproduced three of his Sword Skills, but he is having a hard time reproducing Starburst Stream. Although the Dual Blades Sword Skills are not available in ALO, with the introduction of Original Sword Skills, Kirito has been trying to reproduce his old Dual Blade skills as Original Sword Skills.This strategy is known as the Outside System Skill «Skill Connect». This strategy can only be used for skills where the last hit of a skill leaves the player in a position similar to that of another skill's activation motion. In New ALfheim Online, with the introduction of Sword Skills, it is possible to chain in multiple one-handed sword Sword Skills by performing an activation motion with one sword during the post-motion delay phase of the other sword, thus cancelling out the delay.Kirito using Skill Connect, with two swords. In ALfheim Online, as there is no system assist for dual wielding, players need a lot of practice and experience for such a style to be efficient.In Sword Art Online, attacking without using Sword Skills is inefficient, as a regular attack with a sword is much weaker than an attack using a Sword Skill.
Players may dual wield two swords even without having the Dual Blades skill.Even if a player imports the skill from Sword Art Online, they will find that the skill cannot be identified by the system. Dual Blades does not exist in ALfheim Online.Even after nearly completing it, he did not use the skill against monsters unless in very dire situations. However, as Kirito did not know the conditions of unlocking the skill, he chose to keep his skill a secret to avoid unnecessary attention and problems, thus training the skill only when nobody was around to see it. Kirito had discovered Dual Blades a year before the battle with The Gleam Eyes.According to Heathcliff, this skill is awarded to the player with the fastest reaction time and the chosen player is supposed to be the one who will stand against the final boss (Heathcliff) on the 100 th Floor in the Ruby Palace, regardless of the outcome of the said battle.Kirito used Dual Blades in his fight against Silver Crow. However, Kirito accidentally unleashed the 27-hit Dual Blades Sword Skill «The Eclipse», which allowed Heathcliff to easily block every single hit and make use of the opening created by the post-motion delay. Kirito attempted dual wielding against Heathcliff, who was revealed to be Kayaba Akihiko, without using any Sword Skills, since Akihiko was the maker of the skill. Kirito used the skill in a raid against the 75 th Floor boss, The Skull Reaper. Kirito attempted to use Dual Blades against The Fatal Scythe at the end of the dungeon, but was easily knocked out. Kirito used his Dual Blades while battling against Scavenger Toads in the Hidden Dungeon. Kirito used the skill during a duel against Heathcliff, though Kirito lost the duel due to Heathcliff using the system assistance past its normal limits to help him win the duel. Kirito used Dual Blades for the first time in public in his fight against The Gleam Eyes while trying to save several members of the Aincrad Liberation Force from the boss. Kirito requested for Lisbeth to not tell anyone about the skill. Kirito used one of the Dual Blades Sword Skills to demonstrate his secret skill to Lisbeth after she asked why he needed another sword.