Edit: Thanks everyone - made my day ^_^
Basically it works by trapping the foe in an infinite loop
If the foe decided the wrong path, he starts the loop all over again at the beginning
Itachi is basically forcing Kabuto to release the edo tensei. That is the destiny Itachi set for Kabuto - he must choose to accept it
Notice Itachi says 'you are the one who will decide it', he is literally saying to Kabuto ''accept releasing the edo tensei as your destiny and end the loop''