User blog comment:Miskos3/Fairy Tail Chapter 374: Revolution, Review/@comment-24546844-20140307222302/@comment-7418318-20140307223806

The gravity field was centered on the underside of cube, so maybe it doesn't reach up to the top.

And while it would be a good tactical decision to, now that some FT members have infiltrated the inside of cube, switch off the field to let the slowpokes, wounded and their guards drop to their deaths, I doubt this really happened.