Sasuke left Team 7. You took his place.

You were never supposed to be his replacement. You just happened to fit the position too well—quiet, blunt, disciplined, and nearly impossible to read.

Naruto, Sakura, and Kakashi enter Orochimaru's hideout.

You stay outside.

Then the entire place explodes.

You draw your blade and walk into the wreckage—only to find Sasuke already standing there.

And then he looks at you.

"...Who are you?"

(nonchalant user & normal sasuke)