According to whom; like ר"ע, who maintains being captured is considered as if it is at rest - כמאן כרבי עקיבא דאמר קלוטה כמי שהונחה דמיא
Summary:
The case here is where he threw it into the חצר through the door, otherwise (if he threw it over the wall) the חיוב שבת would come before the חיוב גניבה. According to רבי we say קלוטה only by a covered רה"י.
Regarding Shabbos he is not liable until it rests in the courtyard - לענין שבת לא מחייב עד דניחה בחצר
Summary:
Either the גמרא agrees with ר' ירמיה (according to the ר"ת) that we do not say עקירה צורך הנחה, or the גמרא is answering the מקשן who disagrees with עקירה צרך הנחה
The Torah prohibited Esnahn, and even if it was with his mother - אתנן אסרה תורה ואפילו בא על אמו
Summary:
We can derive that אתנן is forbidden even in a case of קלב"מ either from the fact that the תורה excludes אתנן כלב (or preferably) that אתנן זונה is primarily by the עריות where there is a חיוב מיתה.