User blog comment:Dominic1743/“The Heroes' Journey” Discussion/@comment-44905711-20200124024009/@comment-44905711-20200125004418


 * The lighter could possibly be enchanted or charmed by white magic.
 * Sam received a nasty scar in "Meet The New Boss", for example.
 * At least semi-oftenly they utilize curved implements, and in the opposite cases, it could interpreted as a plot-hole.
 * The fact that they don't show sickness/illness symptoms or getting ticketed onscreen doesn't necessarily mean anything, which while not a solution pretty much renders all your asterisks moot. Not to mention other explanations work and are pliable, such as there is the theory they as the perfect vessels of Michael and Lucifer that their physiology is enhanced. And since befriending Cas in S5, he could constantly heal them of any health problem.