So there's two ways to do RSUltra. There's a quick version, and a long version.
Quick version is done in the early frames of the run. It's a lot like Kara EX Ultra but there's much more leniency for a true confirmation. It goes QCF~PP, QCF+LP, QCF+KKK. Here you basically buffer the first motion of the ultra into the stop, and then just do another fireball + KKK for ultra. This is imo the best way to do the Ultra in close quarters because you should be able to react to most things within half screen pretty easily. Pretty direct.
Next way is a little more interesting. QCF~PP, QCF, QCF, LP~KKK. Obviously, you buffer the full Ultra, so it makes sense to do this one a little later in the run. In this you get an even easier hit confirm, just mash 3 buttons. I think this nice sprinkled in offensively, works vs laggy moves/some fireballs.
The main benefit of both of these versions is, they are pretty much safe because you just stop if you don't want to commit to the super. There's no crazy super input involved for little reward, instead, you have a low risk/high reward offensive maneuver to sprinkle into your game. Use it all at your own discretion.
