The point was to make Amatersu so much stronger.
Oh right, I totally forgotIt increased Enton's strength,
Now you know.Oh right, I totally forgot
@Bold: Does it really matter? Sasuke could have spammed more Enton attacks and spread the black flames. Lol Kishi probably did it just so Naruto won't be left behind.It was a combined attack, and did you not see the size of that FRS? It was as big, if not bigger than Gamakichi.
It made Enton alot stronger