User blog comment:FairyRaven/Fairy Tail Chapter 470: Hybrid Theory, Review and Commentary/@comment-967403-20160126022911/@comment-5303512-20160126124642

It's a classic villain fault, after they had supposedly killed someone they will just leave, look away or just doesn't see it through and ignorantly assume they are dead without taking the time to confirm the death and only to find out that they are not dead. My man Dr. Evil knows what I'm talking about.

Ex. Tenrou Island via Fairy Sphere, Keyes vs Juvia, Hades vs Fairy Tail.