Big thanks to S-Alpha for sharing a JP copy of +R with me.
Note: Slayer didn't actually do a "one frame jump" in the video example (because it involves pressing buttons, faultless defense should not be used in possible cross up situations because you may end up eating a counter hit) but we wanted to mention the technique anyway for general knowledge.
More one is exactly a "one frame jump" can be read here:
http://www.dustloop.com/wiki/index.php?title=Defense_(GGACR)#One_Frame_Jump