User blog comment:Miskos3/Fairy Tail Chapter 367: Jellal vs. Oracion Seis, Review/@comment-4449950-20140121084703/@comment-5668006-20140122161658

Still too much thought put into it. It's all in his head like he mentioned before plus as we know with physics when an object of greater mass is moving that we are on, we are less sensitive to it's movement. That giant 6 legged nirvana was easy to feel movement bc it had legs and was no where near the size of that giant square island and natsu could see the movement bc he was outside vs hes inside of a prison currently