Why?
Because Law landed one move when BB was falling mid air?
BB never even used Yami on Law in battle until now. This is the first Kurozu he's using.
Plz re-read Ace vs BB, he screamed to Hiken, Hotarubi and St. Elmo's spear but yet mid diff'd Ace.
He screams that much because he takes more pain than anyone.
Doesn't mean he's weak.