User blog comment:RainDance96/RWBY's first murder?!/@comment-173.50.57.145-20140725154349

On the topic of Yang's and Mercury's weapons it has already been shown that yang can change he ammunition from a kinetic blast to a high explosive rocket

now compare these shells to the ones on mercury's boots and you will notce that mercury has ammunition with a pointed tip this might mean he has the equivalent of an armor pierceing round for his boots while yang has the equivalent of squashhead rounds