Obviously Chun Li has an abundance of combo tools within the SF4 engine. She has plenty of juggle potential, she gets frame advantage in important places, she can do interesting things in the air, she gains vast forward movement from canceling c.HP, and having a slow fireball helps too. It’s no surprise that she ends up with such a dynamic assortment of combos.
0:11 With Chun Li’s back to the corner, the pushback from C.Viper’s s.HK gets added to the pushback from Chun’s s.HK, swiftly propelling Viper backward into the LP Kikoken. Chun Li has just enough time to dash forward and connect her Hosenka ultra – which has ridiculous range. Whiffing DF+LK was completely superfluous, but there’s too much idle time to kill while waiting for the fireball to travel as far as possible.
0:25 This is another take on my Fun With SF4 vol.1 Chun Li combo; except replacing the initial LP Kikoken with an HP Kikoken tightens up the timing substantially. It’s now performed by combining two charge tricks: returning to DB before pressing HP and maximizing the reversal window. Evidently the SF4 reversal window is around 5 frames, so instead of the first fireball coming out when i press HP, it comes out 4-5 frames later – thereby reducing the interval between the two fireballs appearing on screen. In other words, the second fireball would’ve come out at the same time no matter what, but the reversal delays the first one by 5 frames.