The Spin Kick (スピンキック,Supinkikku?) is a technique used by Shadow the Hedgehog in Sonic the Hedgehog (2006). When using this technique, Shadow does a spinning kick on the ground. Additional, Shadow can follow it up with a combo of additional spinning kicks named Tornado.
When performing the Spin Kick, Shadow presses his left hand against the ground, whether if he is moving or standing still, and holds himself and his entire body up. Shadow then sweeps his legs around in a 360 degree circle that resembles break-dancing somewhat, creating a vortex while his Hover shoes spews out small flames, damaging all nearby enemies. After performing the Spin Kick, Shadow can immediately follow it up with two additional Spin Kick, called the Tornado. When performing this attack, Shadow sweeps his legs around in the same manner, but with each sweep being gradually stronger and wider, eventually forming a small tornado that sucks in nearby enemies and prevent projectiles from damaging him.
To perform Spin Kick in gameplay, the player has to press /. This attack does little damage to enemies. Then, to perform the additional Tornado combo, the player has to repeatedly press / which will damage enemies within a great radius. This move is great to use when surrounded by smaller enemies.
↑ 1.01.1Sonic the Hedgehog (PlayStation 3) North American instruction manual, pg. 14
↑ 2.02.1"While standing still, Shadow can kick his enemies, delivering a little damage. However, if you repeatedly press the attack button, Shadow will spin so fast while kicking that he creates a vortex that damages any enemy caught in its radius. This is a great move to use when you’re surrounded by small enemies." - Sonic the Hedgehog: Official Game Guide, pg. 13