User blog comment:Almerzskie/chapter 601,.Luffy's new technique?gear 2 with a new style?/@comment-1595565-20101021150849

It appears taht he can control what part of his body he sends the powerup to. Like how with gear third he only expands one limb, now he can designate the energy to a specific part of his body. The way it looked, it sort of reminded me of the quake bubbles that would appear on Whitebeard's hand when he used the gura gura no mi.