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|Binding Style (Arena Fighting)||Two-Weapon Fighting||While you wield a spear and a flail, if you hit one creature with both attacks, you can slide that target 1 square.|
|Nerathi Vanguard Style (Arena Fighting)||Human or Con 13||If you’re wielding two melee weapons and both attacks miss, you gain a +2 shield bonus to AC against the target or targets of your attacks until the end of your next turn.|
|Swift Blade Style (Arena Fighting)||Two-Weapon Fighting||If both attacks hit and you are wielding a light blade in each hand, you deal extra damage equal to your Dexterity modifier to one of your targets.|
|Turathi Assault Style (Arena Fighting)||Tiefling or Int 13||If your first attack with this exploit hits, you gain a +1 feat bonus to the second attack’s attack roll.|
On April 1, 2001, Wizards of the Coast published a fake update to twin strike. There appear to be multiple instances of the fake update:
- One fake update changed twin strike's damage to 1, or 2 at 21st level, and replaced the flavor text with "If the first attack doesn't kill it, the second one probably won't either."
- As of now, this update has the first attack inflict 1[W]+Ability modifier damage, and if that attack hits, a secondary attack on the same target doing the same amount of damage. This change causes the power to be slightly more powerful than the scout's dual weapon attack. The flavor text is "If the first attack doesn't kill it, the second attack will at least hit it". 
- From another URL, Twin Strike has an insta-kill effect. If you hit the same creature twice, it must make a saving throw, where a failure causes it to drop to 0 hit points. "If the first attack doesn't kill it, the second one will." 
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