Well the spherical fold or what i call "Fold Field", in my opinion is cause because of the ship was in the atmoshpere, thats why its as visable as it, is it reacted with the atmosphere, i mean look at DYRL? when britai's ship begins to fold all the attacking meltran Bolt, and when hikaru got close again the ostrich got caught in the field and flung at earth, due to the elongation of the filed because of the ships relitive velocity and due to the vacuum of space the field remains pretty much invisable except for on the surface of the ship. So i have concluded there is such a visible Sphear because of the atmosphere.
Okay now im done, procede with the verbal beating