In this so-called sacrifice throw, similar to the Judo technique, the
practitioner falls backward to throw the opponent far to the rear. Also, although other Vortex Throws are typically executed by grabbing the enemy's lapels, the Hazuki Style Vortex Throw is executed by executing a hold on the inner joints of both the enemy's arms and pinning them under the practitioner's arms. Thus it is impossible for the enemy to assume a defensive position to lessen the shock caused by the throw. Depending on the reflexes of the practitioner, it is also possible to deliver a decisive blow after executing the throw. The more aggressive the enemy's attack, the more effective the throw.
Move Origins
The Vortex Throw comes from the throw tomoe nage (巴投), or circle throw. Tomoe nage is an old throw originating from jiujitsu. It is one of the original 40 throws codified by judo founder Jigoro Kano and remains a popular throw in modern competition.
"Hazuki Style" Vortex Throw
Throws that prevent the opponent from lessening the shock of the throw (i.e. breakfalling) aren't used much in the sports-focused and litigation-happy martial arts of today, but were more common in the older arts like classical jiujitsu that prioritized battlefield effectiveness. Versions of tomoe nage can be found in historic European wrestling traditions that are quite similar to the move description.
(Talhoffer Fechtbuch MS_Thott.290.2º)
Decisive Blow
The full version of the Vortex Throw with the extra inputs has Ryo roll onto of his opponent after the throw and landing on them with a knee drop.The practical application is that it lands the user of the throw in a dominant position on the ground, enabling further control, strikes, or submissions.
Attempting to damage the opponent with the knee drop, while being more in-line with Ryo's fighting style, is a less reliable method of following-through with the Vortex Throw. However, I have seen 2 instances of fights being ended with grounded knee drops in (admittedly low level) MMA recently.