Does anyone know? Sorry if it's been asked, I was just curious.
It was just fate screwing around with Sasuke cause at the most important moment, the last of the clan can't perform the clan's most powerful justu, the Art of Run.
You just know the wall was screaming at Sasuke, "Where you gonna run now, bitch?! Uchiha = Shit"
Then Itachi got angry and headbutted it.
It should be a part of the hideout.Acutally it's an effect of Susanoo, not part of the Hideout.