This is carrion and this is prey.
In the question: Both are bad. Both possibilities are bad (carrion means a dead animal, a gentile is a living person who has died. Prey means an animal that has died without following the procedures of slaughter. Both carrion and prey are not kosher for food).
("If two olive trees fall in the wilderness, which are divided in their wilderness, this is carrion and this is prey" - Peri Maggidim Yore Dea opening opening for prey to go, and so: "When a man's years are many and he reaches forty years old...and when he is old, his soul will be troubled, saying that now his strength is not as it was at first, and he is not according to his glory. To sit with men in secret from games, his glory is only in the great...with men of his form...and on long nights kings sat and talked about the land and the fruits, about the forests and the kingdoms...and smoke and coffee rose from it...this is a corpse and this is a piece of wood, and these and these are burned in the house of the fire" - Pela Yoetz/ Oth 7, old man)
Translation
Expression (Hebrew)
זֶה נְבֵלָה וְזֶה טְרֵפָה
Definition (Hebrew)
בְּהַשְׁאָלָה: שְׁנֵיהֶם גְּרוּעִים. שְׁתֵּי הָאֶפְשָׁרוּיוֹת רָעוֹת (נְבֵלָה מַשְׁמָע פֶּגֶר, גּוֹיִית בַּעַל חַיִּים שֶׁמֵּת. טְרֵפָה מַשְׁמָע חַיָּה שֶׁהוּמְתָה שֶׁלֹּא ע"פ הִלְכוֹת הַשְּׁחִיטָה. גַּם הַנְּבֵלָה וְגַם הַטְּרֵפָה אֵינָם כְּשֵׁרִים לְמַאֲכָל).
("אִם נָפְלוּ ב' זֵיתֵי אִסּוּר שֶׁחֲלוּקִין בְּאִסּוּרֵיהֶן זֶה נְבֵלָה וְזֶה טְרֵפָה"- פְּרִי מְגָדִים יוֹרֶה דֵּעָה פְּתִיחוּת פְּתִיחָה לְהִלְכוֹת טְרֵפוֹת, וְכֵן:"מִשֶּׁעָבְרוּ רֹב שְׁנוֹתָיו שֶׁל אָדָם וְהִגִּיעַ לְבֶן אַרְבָּעִים...וְכַאֲשֶׁר יַזְקִין יַשִּׁיאֶנּוּ יִצְרוֹ לֵאמֹר שֶׁעַתָּה אֵין כּוֹחוֹ כְּבָרִאשׁוֹנָה,וְאֵינוֹ לְפִי כְּבוֹדוֹ לֵשֵׁב עִם בַּחוּרִים בְּסוֹד מִשְׂחָקִים, רַק כְּבוֹדוֹ בִּגְדוֹלִים...עִם אַנְשֵׁי צוּרָה...וּבַלֵּילוֹת אֲרֻכִּים יָשְׁבוּ שָׂרִים נִדְבְּרוּ עַל הָאָרֶץ וְעַל הַפֵּרוֹת,עַל הֶעָרִים וְעַל הַמַּמְלָכוֹת...וּמַעֲלָה עָשָׁן וקאו"י(קָפֶה)...זוֹ נְבֵלָה וְזוֹ חֲתִיכָה דאיסורה, וְאֵלּוּ וָאֵלּוּ נִשְׂרָפִין בְּבֵית הַדָּשֶׁן"-פֶּלֶא יוֹעֵץ/ אוֹת ז', זָקֵן)