Board Thread:Versus Debates/@comment-28300173-20161104104110/@comment-25122992-20161120151559

It's true, but again, all depents on some minor circumstances. B can surely use a tentacle to escape, but if Itachi manages to notice the substitution with his Sharingan (something Sasuke failed to do due to him deactivating it), then Itachi would try to target this tentacle with Amaterasu again, and if B gets caught, he wouldn't have any way to escape once more.