I'm not sure if this should even be posted here, but I noticed that Hazama's taunt changes when you're playing against Ragna. The taunt is quicker than his usual match-up taunt, so if you have 100% heat, you can rapid cancel after Jayoku Houtenjin -> Taunt -> Guarantee a follow-up.
Oh, and if you taunt and grab at the same time, he'll do the laugh while grabbing.
Kind of useless outside of trolling purposes and might already be known, but I'm new around here so... just sayin'.