1)
What is the meaning of "Hoser"?
1.
Rashi: Release prisoners from their binds. This is like "Matir Asurim", "Shalach Melech va'Yatirehu" (146:7, 105:20).
2.
Radak #1, Malbim: Refer to 79:11:2:2.
3.
Radak #2: Release their binds - they are tied in Galus. This is why they are called Asir!
2)
Who are "Bnei Semusah"?
1.
Rashi: Those who were killed for You. This is like 'it is better that Yisrael eat slaughtered Temusah meat, and not Neveilah Temusah meat (Kidushin 21b), i.e. an animal that is dangerously ill.
2.
Radak, Malbim: They are close to death. Leave them alive!