User blog comment:B214/Volume 17 spoilers./@comment-117.217.186.212-20140224111716/@comment-14716567-20140227220613

Based on the powers of the Boosted Gear it might be an Absorb power, not just that the enemies attack gets absorbed and returned to them but that the raw power from the absorbed attack gets added to the users overall strength. So basically the more someone attacks, the more Vali would powerup.

Its plausible that it might be something like boosting things like weight, or stamina. But the absorb I think would be more likely.