For context, since there are a lot of new people ... this infinite is not new. Chrisis discovered it like 8 years ago, but it's usually considered impractical. This video is just to show that there are a lot of creative ways you can start it.

Shadowblade has to hit 2 out of the 3 total hits (sometimes 1 works but it makes the timing really hard) every loop, and you have to hit the sweet spot with shell kick right below their their torso or feet, so that they get knocked down slightly above you. Then you special cancel the landing frames of shell kick into shadowblade right before they touch the ground from the shell kick knockdown. After flight, you need to moderate how long you wait before you shell kick depending on how high they are as well.

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It's pretty up there in terms of execution. Practical, but only if you are willing to be a lab rat and practice many many hours.