User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-3976024-20151003214424/@comment-24834479-20151025172743

1. Sam was able to cast out Gadreel because he was severely weakened from the fall.

2. Pureblooded werewolves either mean that they were directly made by the alpha (or close), or that they are born from two werewolves, not being a human turned.

3. That's just their style.

4. I think that they had their suspicious, but then knew it once Cain was corrupted.

5. It made him rave with jealousy and violence.