Board Thread:Theories and Speculation/@comment-26889573-20151008053113/@comment-1872728-20151011225802

I don't recall the specific example you're talking about. From my knowledge, Sasuke can either modify the shape of the flames or put the flames onto a projectile like a Susanoo arrow or yasaka magatama. "The user can wield the flames in their hand without being incinerated, as well as manipulate them into a flexible sword which launches spike-shaped projectiles when swung." (http://naruto.wikia.com/wiki/Kagutsuchi).