English: This teaches that he saw the Angel of Death arrayed against him. Rabbi Yochanan said: From here we learned that one whose dead lies before him is exempt from the reading of the Shema, from prayer, and from tefillin.
On the daf / in context: Avraham’s rising is linked both to the presence of the Angel of Death and to the halakhah that a mourner whose dead is still before him is free of the positive commandments of Shema, prayer, and tefillin.
Type of Learning
Derash on the verse (midrash + halakhic inference) — not a formal named middah of the 13: the act of rising is taken as the moment the legal status of the one whose dead lies before him is defined.
What Is Learned
One whose dead still lies before him is exempt from Shema, prayer, and tefillin; Avraham’s rising from before Sarah is the scriptural illustration of that status.