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they were training and naruto was himself until three tails, he spiraled out of control once the fourth tail appeared and Jiraiya did not know that it will happen. Jiraiya may easily have gotten hurt while trying to make naruto come back to his senses much like sakura but it seems that is conveniently ignored
in the end however he completely stopped naruto without even using SM while all oro could do was run away
Stopping naruto without the intent to kill vs Fighting seriously and failing to even put a scratch on naruto, i wonder which is a bigger feat