Partial knowledge of Abhimanyu and Ashwatthama

Abhimanyu is often quoted as an example for his partial knowledge about Chakravyooh. Since, he knew how to penetrate the Chakravyooh, but did not know how to exit from it during the time of danger contributed to his death. Similarly, Ashwatthama too had a partial knowledge in the context of Brahmastra. He only knew how to invoke it. But did not know how to withdraw it. It was only Arjuna who had complete knowledge of both Chakravyooh (to break and exit from it) and Brahmastra (to invoke and withdraw it).

In case of Abhimanyu - Abhimanyu was also the reincarnation of Moon’s son. When God requested Moon to let his son be incarnated on Eath, the moon agreed but said that could not bear apartness from his son for more than 16 years. Hence when he was receiving knowledge in the womb in the half her mother slept

In case of Ashwatthama, Dronacharya teaches Ashwatthama only to invoke Brahmastra, but does not teach him how to withdraw it. If an archer is aware of both the invocation and withdrawal of Brahmastra, then he can invoke it as many times as he wants. Hence, to avoid Ashwatthama from invoking Brahmastra multiple times, Dronacharya only gives a partial knowledge about it.If an archer invokes Brahmastra, it not only destroys the target, but also leads to a famine for 12 years in the region. If a Brahmastra is invoked twice, then it can even lead to draining the entire ocean on Earth.