Raikage... the Kenpachi of the Naruto world.
Sasuke's arrogance it beyond out of control at this point. He barely survived fighting Killer B(basically getting killed twice in the process and only being saved by his teammates), so now he's gonna take on his probably stronger older brother for no particular reason.
Except the person giving Raikage directions is actually, you know, good at it.
That's from when he saved Sasuke after having his chest torn out. He used his own body mass to replace Sasukes, and afterwards, he looked like a kid.