Kakashi has a speech Naruto told him about just in case.
Obito would blitz him before he could say a word.
It would be like this:
*Kakashi fappin in Kamui world*
Kakashi: "A true ninja always has fap breaks"
*Juubito appears*
Kakashi: "Oh shit!!!!!!!!!!, fkk!"
*Kakashi warps out*
Juubito: "**** you, Kakashi"