The following is a list of karate technique you will see in the video: juji uke (knife pass and trap); chudan soto uke (arm bar); kake ashi dachi (foot sweep); zenkutsu dachi (foot sweep). In addition you will see a knife held in an ice pick grip used for capturing and controlling. If unarmed, kokken may be used to hook and control the opponent's offending limb. An expert might appreciate these things, but a beginner needs a partner (and a knowledgeable instructor).
As Uzi, Massimo and I practice the technique, note how we try to disrupt the adversary's balance before sweeping. Arm bars, stabbing, pushing and position are used to displace the opponent to the point that the sweep becomes effortless. Notice too how arm bars soften up the adversary for weapon disarms and chicken wings.
A word on transitions, kake ashi dachi (cross legged stance) and zenkutsu dachi (front leaning stance) I hope you appreciate, by now, are not intermediate steps to a final objective. If you have any practical fighting experience you understand that there is no tactical reason to ever cross legs (in the case of kake ashi dachi) when transiting sideways unless you wish to give your opponent an advantage. The stance represents a sweep. When Uzi executes a zenkutsu dachi, notice how he uses his torso as a fulcrum in an arm-bar to unbalance me for the sweep. The notion that stances are transitory phases of a body in motion should be put to rest. When combined with the images of what the adversary is experiencing contemporaneously, the dachi (stances) represent takedowns or some other technique of dominance or control. Kake ashi dachi- it only looks like you are crossing your legs, but remember that the other guy is falling. Zenkutsu dachi- it only looks like you've over committed to your lunge, but remember that the other guy has been unbalanced an is about to fall.
Finally, the video closes with a loop of Uzi repeating a key point for head control and the neck crank. Details, details. I hope you found this interesting and helpful in your quest for a better karate.
My thanks to Maul Mornie, and SSBD brothers Uzi and Massimo.