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Downplayed: Bob has a sword in one hand, a knife in the other.
Justified: Bob is ambidextrous or is trained in a unique fighting style that uses two swords.
Bob single wields a weapon that is traditionally dual-wielded (e.g. a single brass knuckle)
Bob uses half a weapon.
Bob wields a knife with two hands.
Bob picks up a sword in each hand... and then drops one due to feeling overburdened.
Bob dual wields 2 BFS, and promptly injures his wrists
Double Subverted: But that's because he's tired. Or already injured to begin with. At full power, Bob can easily carry two swords.
Parodied: Bob wields eight swords at the same time: Two in each hand, with one held normally and the other as a Backhand Blade; one in one foot, with him hopping around on the other; one in his mouth, Pirate-style and one sword in each armpit.
Bob dual and single wields according to the situation he finds himself landing in.
Bob constantly switches between one sword and two swords due to being indecisive about which setup is better... or due to him constantly losing and finding new weapons.
Bob has a Bifurcated Weapon, and as such can switch between single- and dual-wielding as he damn well pleases.
Averted: Bob wields a single sword throughout his adventure.
Enforced: "Rule of Cool dictates that two swords are better than one, so give our hero two swords!"
Lampshaded: "You're using TWO swords!? That's either really badass or really stupid."
Invoked: Bob wields two swords, believing that they would be more effective than just one weapon.
Exploited: Bob dual wields swords because their sheer badassery makes them more effective.
Defied: After exploring the flaws of dual wielding, Bob decides to use a single weapon instead.
Discussed: "Newbies always think wielding two swords makes them better. If they stopped being stupid and explored the flaws and advantages of dual wielding, they would trip over their own hands less."
Conversed: Here, take this second sword. It really complements your first sword. Why not use both at once while you're at it?
Bob charges into battle with twin swords... But he is easily out-maneuvered by an enemy wielding one sword due to the real-life flaws of a dual wielding.
Bob is hit by an arrow because he's using two swords instead of a sword and a shield.
Bob loses one of his swords in the middle of a fight. Since he was trained exclusively in Dual Wielding, his swordsmanship is extremely poor with only one blade.