Two disciples of Acharya Haribhadrasuriji, namely Hans and Paramhans  were killed at the hands of followers of other religion. Acharyashri  suffered great mental commotion. The shock of the killing of his loving  disciples caused a sense of revenge in him. Acharyashri decided to kill  1444 students and lecturers of Bauddha Vihar by roasting them alive in  boiling oil. Anger and revenge leave no place for discretion.
With a view to executing his malicious plan, Acharyashri closed the  doors of the upashraya (a place for the stay of Jain monks and nuns) and  boiled oil in a huge vessel on a furnace. With the sheer power of  incantation, Acharyashri called all the students and lecturers and made  them stand in the sky. Actually the infuriated Acharyashri planned and  intended to call the students and the lecturers one by one and fry them  alive in the boiling oil.
 Yakini Mahattara came to know about this malicious plan of the  Acharya and soon she came rushing to the upashraya. The doors were  closed and Acharya Haribhadrasuri told Yakini Mahattara whom he regarded  as his own mother: “I am engaged in some rites. Please come after some  time.” In a firm voice she said: “I need you urgently. Kindly open the  doors.” The doors were opened and Yakini Mahattara paid her respects to  Acharyashri and then she said that she had come for atonement.
 Acharya Haribhadrasuri, the learned scholar introduced himself as the  son of Yakini Mahattara because previously he had been unable to  understand a shloka (verse) of Yakini Mahattara and his pride of  scholarship had suffered a great set-back. Having been defeated in  learning, he ultimately had accepted initiation from Jindattasuriji. As  Yakini Mahattara had led the Acharya to the righteous path, he regarded  her as his own mother. Hence Shri Haribhadrasuri became anxious as to  what sin such a motherly nun would have done that necessitated  atonement.
 Yakini Mahattara told that while she had been walking a frog was  unknowingly crushed under her feet. Her soul was suffering great torment  because of such violence committed by her. She wanted to have atonement  because if her life were to end without the sin being duly atoned for,  her life would be that of a violator.
 Acharya Haribhadrasuri raised his voice and said, “Oh! You couldn’t  care about a living being! You must make atonement for it.” Yakini  Mahattara very respectfully accepted the atonement but politely added:  “I have secured atonement for a sub-human being like a frog unknowingly  killed by me. But you are engaged in a deliberate violence by way of  killing 1444 human beings. What would be the atonement for this  killing?”
 These words of Yakini Mahattara dispelled the anger and fury of  Acharyashri Haribhadra. The lecturers and students who were called by  his sheer power of incantation were sent back. As an atonement for his  malicious plan, he composed 1444 books elucidating human virtues like  forbearance, tolerance etc. Animosity gave way to learning and  scholarship.
 Acharya Haribhadrasuri always respected Sadhvi Yakini Mahattara and  he used to accept the fact that thanks to Sadhviji, he had found the  royal road of Jainism that liberated himself from the cycle of births.
story by: http://www.tattvagyan.com