Sesshomaru demonstrated it to Inuyasha and during a battle when Inuyasha was blinded he learned to use his other senses beside his eyes and "feels" the two wind "paths" blending together creating a wind scar, he strikes it with his Tenseiga and bam the magic happens. :)
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Episode 97 of Inuyasha: Kirara, Come Home! doesn't actually say when InuYasha practices the Wind Scar on Kirara, but from looking at the flashback when Shippo points out various things Inuyasha has done to Kirara; this leads me to believe that this may have happened in Episode 36 of InuYasha: "Kagome Kidnapped by Koga, The Wolf-Demon".
Shippo bites Inuyasha on the butt using 'Heart Scar' on episode 130
when Inuyasha first uses the wind scar successfully on Sesshomaru, Sesshomaru is warped by tensaiga to a forest where he meets Rin for the first time.
That epidoe is called "The Backlash Wave: Tetsusaiga's Ultimate Technique." It's the second episode of Inuyasha's battle with Ryukotsei.
==Fighting moves== iron reaper soul stealer == slashes opponent with his sharp claws blades of blood == hurls blades made of blood at his opponent (needs blood on his hands to do this move) ==weapon moves== Wind scar == slashes the wind scar and sends energy waves at the opponent (is also used to break through barriers) Backlash wave == bursts thru the oponents energy blast and slashes it with the windscar technique to hurl both attacks back at the opponent