Hello there MMOwned,
I noticed this when i was running Azjol-nerub with my group.
Basically, When u kill like almost every mob in Azjol-nerub they drop no loot, But are skinable only for like 5 secounds. Skin then right when they die, they have a high chance of droping nerub chitin, which sells for 13g each on my server, and they always drop at least a borean leather.
This is a great way to level up and level ur LW or just make gold if ur a skinner