I just got finished with [media=youtube]NadAipFN6_A"[/media] which features a few of these so I figured now is a good time to post about it.
Many Ultras in sf4 are a mix of the autocombo final justice type move and just a regular juggle.
The autocombo parts have a lot of potential for screwing up. Sf4 tries to avoid it by making these ultras uninterruptable but that has consequences too.
The oldest known way to break them happens when you trade with Bison’s ultra in the corner. You can see a good example of it at the start of this [media=youtube]wpiksJLyCYA"[/media]
Basically the main character stops but the autocombo caused a strange hit reaction that causes very long stun for the dummy.
[media=youtube]NadAipFN6_A#t=1m2s"]Fei Long, C. Viper, and Rufas ( on both Superand Ultra see [) all have examples of this.
A Ken only method that I found is the opposite of the above Bison glitch. Instead of knocking the main character out of the autocombo it [media=youtube]zPmlYVQltGI"]knocks the dummy out](http://www.youtube.com/watch?v=y9KdexlnELk"/media). This leads to a very bizarre glitch because ken will finish his ultra no matter what. [A third recently found method is if the opponent becomes dizzy during the autocombo.
smileymike101 shows it with Seth [media=youtube]b9DUMRWzPrE#t=10m15s"]here and in the first video I show the more complex setups to do it with Ken and Sakura. It’s fairly easy to explain, the ultra’s don’t care what the opponent is doing, if they start, they’re not programed to stop. It also suggest that last few hit’s of kens ultra are not an autocombo because they miss on a dizzy opponent. I have no idea why [URL=“http://www.youtube.com/watch?v=y9RaHynhn2o#t=4m47s”[/media]
So what do you think, did Capcom program the correct way to handle these complex situations? I know if i were a Guile player I would prefer his ultra to be an autocombo, and Sagat players would love to juggle their ultra in the corner.