Q 1:
A car ran over my sheep, breaking its back and legs. I hurried to it and slaughtered it while it was still alive, walking and stumbling.
After I slaughtered it and stripped off its skin, a man came to me and said that (Part No. 22; Page No. 384
If the reality is as you mentioned, this slaughtered animal is Halal (lawful), for you slaughtered it while it was still alive. Allah (Exalted be He) says:
Forbidden to you (for food) are: Al-Maitah (the dead animals - cattle - beast not slaughtered), blood
up till:
...and that which has been (partly) eaten by a wild animal, unless you are able to slaughter it (before its death)
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.