Supernatural's Demon-Killing kisu Created A Season 4 Plot Hole That Still Makes No Sense 

screenrant.com -BY MAE ABDULBAKI -The demon-killing kisu was a choice weapon for Sam and Dean throughout Supernatural. But its use in season 4 may have created a confusing plot hole.
maneno muhimu: Supernatural, demon-killing kisu, season 4, plot hole, still makes no sense