1)
How is Hashem "Go'el mi'Shachas"?
1.
Radak #1: Sometimes due to a sin, one is Chayav Misah, or his Nefesh should perish in the world to come. Hashem redeems him via Teshuvah - he regrets and repents in front of Kel.
2.
Radak #2, Malbim: Hashem afflicts him with illnesses to redeem his Nefesh.
2)
How does Hashem crown him with Chesed and mercy?
1.
Radak: He afflicts him with illnesses to redeem his Nefesh.
2.
Malbim (5): When the Nefesh leaves the body, it is renewed like a Nesher, whose feathers fall off and it grows new feathers, with which it flies to Shamayim. So the Nefesh, after it removes its earthly body, it wears festive attire, in which it flies to its residence and its Father's above.
