Secret Art: Lightning Release

You infuse yourself with Lightning and gain Lightning Release until the end of the encounter, allowing you to deal Lightning damage with your unarmed attacks and immediately enter the Heavenly Lightning Stance. While this lasts, you also gain the following benefits: 

• Your movement speed is doubled.
• You can make an additional attack when you use Double Punch. 
• When making an unarmed attack, your critical threshold is lowered by 1 (19-20 base). Whenever you hit with a critical hit with an unarmed attack that deals Lightning damage, the attack arcs to a different enemy within 20ft of the original target. This attack uses the same attack roll and damage, but cannot arc again.

If you ever leave the Lightning Stance, you lose the benefit of this.