Board Thread:Naruto Discussions/@comment-25516007-20141008201906/@comment-26302001-20141016004640

Konan knew he had a 5 minute time limit on it, she most likely shared that with Nagato. Also as much of a genius as Itachi is and as fast as he is.. just like Minato he would find a way to hurt Obito and eventually kill him. Obito wouldn't mess with them because he knew it would result in his death. Itachi also had Izanami at his disposal and for the sake of logic, he most likely had Izanagi too.