User blog comment:Phantomlink959/V3C4 preview/@comment-5426254-20151126034020/@comment-24994749-20151126040555

As for the mini-gun ammunition, it's possible Coco is using a lower calibre to not be overkill since she is fighting human opponents and this is supposed to be a friendly competition.

As for what were those things coming out of Mercury's boots... I dunno, some form of wind dust bullets?