Since it is a rabbinic interpretation - הואיל ומדרש חכמים הוא
Summary:
According to the ר"ת the requirement for a גט שחרור by שאר ראשי אברים is only מדרבנן, while according to the ריב"א it is מה"ת since the דרשה of ישלחנו indicates the use of the גז"ש of שילוח from אשה.
He was blind and he removed it, he goes out free - סמויה וחטטה יוצא בהן לחירות
Summary:
There is a difference whether one blinds someone whose eyes were not functional (where he does not go free), or whether one removes the eyeball of a blind person (where he goes free since he became a מחוסר אבר).
It teaches us by saying. ‘from the fowl’, but not all the fowl - תלמוד לומר מן העוף ולא כל העוף
Summary:
If not for the פסוק of מכל העוף, we would assume that the פסוק by נח is referring to ישראל, but not to ב"נ. Alternately we may have thought that the פסול of מחוסר אבר is only by בהמה, but not by עוף.