Are you referring to chapter 148? I may have mentioned loose change and all, but making a makeshift blackjack or such and (poorly) increasing the mass of your fist are fairly different. I also barely remembered that scene enough to go looking for it after having read through the rest of the chapters following this one since the comment here, so I probably didn't remember it consciously at all when I posted that one. Honestly, I probably just said loose change here because it's something students might have on hand that would make a decent weapon out of a pair of stockings. You can pretty much use anything, rocks would work just as well.