User blog comment:Miskos3/Fairy Tail Episode 190: The One Who Closes the Door, Review/@comment-4999650-20140712163527/@comment-7418318-20140712170921

What Hades used against Wendy was an overwhelmingly strong attack, while F-Rogue used a low-powered pinpoint attack. Maybe that's why Horologium couldn't detect the latter from the Spirit World.

Or he might have been unable to come because he already saved Arcadios just a short while ago.

Or the Eclipse somehow interfered with his ability to sense the attack. Hell's Palace might have been far enough underground that it was outside of Eclipse's "jamming" area of effect.