User blog comment:Master Moridin/Mercury's Boots Don't Just Shoot Bullets/@comment-173.58.100.7-20151210054148/@comment-26397825-20151210055044

It wouldn't surprise me if steam actually gives people a boost mid-air, and that's what Mercury did. It was capable of lifting Neon into the air for Yang to defeat in the FNKI vs RWBY fight, and they used to use steam to power things which shows how useful it can be. Like trains.