These bonuses also apply while wielding a Bastard Sword or Dwarven Waraxe in your main hand and a Shield, Orb, Rune Arm, or Nothing in your off-hand. You are not considered to be Two-Handed Fighting while in Druid Animal Forms or using handwraps.
Strikethrough grants a chance for your melee attacks to attack a second target. Strikethrough begins at 20% while Two-Handed Fighting, and if Strikethrough is over 100%, you will always attack a second target with a chance to attack a third.
If it is over 200%, you will always attack a third target with a chance to attack a fourth.
If it is over 300%, you will always attack a fourth target with a chance to attack a fifth.
If it is 500% or higher, you will always attack five target.
In addition, While using a Two Handed Weapon (not including Bastard Sword, Dwarven Waraxe, or Druid Animal Forms), your Ability Score Modifier bonus to damage improves by 25% (This adds to the existing 50% for using a Two Handed Weapon).
As of Update 5 this feat worked with glancing blows caused by Bastard Swords and Dwarven Axes when wielded as a single weapon or weapon and shield combination.
As of Update 23 glancing blows worked while moving if a character has this feat.