I tried that Ryu/Rock simultaneous super trick that Tetsuwan Convoy mentioned earlier, if you have maxed out level five bar you can throw in another Rock machine gun combo after you call out Ryu again which can rack up a neat 100+ combo and nab you that "tatsunical (?)" remark from the announcer.
All in all that takes off roughly half the health bar, I don't know if that's a good way to use five bars if you're playing competitively.