I'm going to go out on a limb and say it's not that impressive just unique. They probably just stopped the engine from interpolating between keyframes, or wrote a script that made sure each frame had a certain amount of "air time". It still looks awesome though.
This is an abridged amateur translation of the article. May it inform you still. Anyone fluent in japanese is invited to report glaring errors. Original article there The article is the first in a new series of technical articles on 4gamer by Zenji Nishikawa about game graphics, and Guilty gear Xrd, which came out in…