Board Thread:Naruto Discussions/@comment-26403664-20160228225013/@comment-734582-20160315143121

Tasuxeda wrote: We don't know that because they were trying to capture him not kill him. Sasuke used the same techniques he used against Danzo (another guy he actually tried to kill) and it didn't work. They used Amaterasu, and it didn't work. None of their techniques, even when used to actually kill people before, worked.

Even then, it's not important. he didn't use it when under Kabuto's control, he didn't use it against Nagato.