Perhaps she will go to them - דלמא אזלא איהי לגבייהו
Summary:
The בועל is considered קבוע only if the איסור took place in his house.
The concept of הדרא לניחותא is limited to the source of the איסור at the time of the איסור. Otherwise it is considered פריש, even if after the מעשה איסור it is הדרא לניחותא.
It excludes, one who throws a stone in their midst - פרט לזורק אבן לגו
Summary:
ר"ש cannot derive קבוע from וארב לו (he needs it for נתכוין להרוג). He cannot derive from נתינה נתינה according to the תנא דבי חזקיה. From where does ר"ש derive the rule of קבוע?!
And a doubt in capital offences is judged leniently - וספק נפשות להקל
Summary:
Even if we maintain that התראת ספק שמיה התראה, nevertheless in a case where there מותרה is not certain that his action will lead to an איסור it is not a התראה.