User blog comment:Thescarypea/EmpyreanSmoke, please confirm that your friend's an SPN writer/@comment-93.132.40.186-20150925191303/@comment-3481504-20150925213320

Wendigos are more paranormal, who got their powers through cannibalism. They're still pretty much human, but just A LOT stronger and faster, so it makes sense that fire can fry them.

There's absolutely no reason to believe they were lying, they sounded doubtlessly confident that they could just wipe it out. Lucifer probably had death do it because he was still in Nick for a long time at this point and so his powers were drooping to the point where he couldn't do it himself.

Castiel didn't seem affected at all from that fall, he hardly seemed even dazed or wobbly weakened.

This one is up for debate.