«أو ما كان الأصل فيه الإباحة، فعرض ما أخرجه عنها، ولم يغلب على الظن تحريمه كسؤر سباع الطير»
The other form concerns something originally permissible, later affected by a factor that prevents unqualified permissibility without establishing a strong presumption of prohibition; the text illustrates it through water left by predatory birds.
The first form involved a relaxation due to widespread hardship. The second begins with permissibility but acquires a reason for mild disapproval.
Keeping the two patterns separate makes the grounds of classification intelligible rather than memorizing both merely under the same name.