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1. If someone is pursuing another person in order to kill him, or a Zachor or Ervah in order to have relations with them - it is a Mitzvah to prevent him from sinning, even at the cost of his life.
2. If someone is pursuing an animal, or trying to be Mechalel Shabbos or worship Avodah Zarah - it is forbidden to kill him in order to prevent him from sinning.
3. If someone sees that his friend is drowning, is being mauled by a wild animal, or is being threatened by bandits - he is obligated to save his friend's life.
4. If someone is pursuing a woman who is a prohibited to him by a negative prohibition (but relations with her is not punishable by Kares or Misah) - it is forbidden to kill him in order to prevent him from sinning.
5. There is a disagreement as to whether we may kill one who is pursuing an Ervah if the Ervah herself does not want her pursuer to be killed.
6. Someone who seduces or rapes a Na'arah must pay her a 50 Shekel fine - even if she is a prohibited to him with Chiyuv Kares.
7. There is a disagreement if Ha'ara'ah is Neshikas Ever or Hachnasas Atarah.
A BIT MORE
1. Once the Aveirah has already been committed, it is forbidden to kill the sinner. Rather, the sinner must be brought before Beis Din if he is to be punished.
2. Rebbi Shimon argues with the Tana of our Mishnah. He learns that if someone is on his way to worship Avodah Zarah, it *is* permitted to prevent him from sinning by killing him. Rebbi Elazar Bar Shimon says that even if someone is running to be Mechalel Shabbos, it is permitted to prevent him from sinning by killing him.
3. It is a Mitzvah to save his friend in any way that he can. If he has no way to save his friend other than by hiring people to do so - he is obligated to hire them.
4. The Torah authorizes a person to kill the sinner only when it will prevent another person (the one with whom he has relations) from severe disgrace. If the woman is only prohibited by a negative prohibition, her disgrace is minor.
5. Rebbi Yehudah learns the pursuer may not be killed. The Torah only allows us to kill a the pursuer out of concern that the woman will give up her life rather than allow the pursuer to commit the sin he wants to commit. However, the Rabanan disagree and maintain that the pursuer may be killed despite the woman's protests. They maintain that the Torah allows us to kill the pursuer because of the severe disgrace that the woman suffers, not because of the concern that she will give up her life.
6. The Torah obligates a person who seduces or rapes a Na'arah to pay a fine to her father. He must pay the fine even if she is a prohibited to him with Chiyuv Kares. This is because a Chiyuv Kares does not exempt the sinner from payments, as a Chiyuv Misah does (Kim Lei bid'Raba Minei).
7. IF HA'ARA'AH IS NESHIKAS EVER, WHEN A PERSON PURSUES A WOMAN AND DOES NESHIKAH HE HAS ALREADY CAUSED HER SEVERE DISGRACE, EVEN THOUGH HER BESULIM REMAIN INTACT. THEREFORE IT IS NO LONGER PERMISSIBLE TO KILL THE PURSUER.
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