So, to confuse you all further, I made a timeline. Or time knot. Or something.

Pendarric understands it somewhat.
Basically, the spell shunted the localized area... Bellas and surrounds... into the Etherial realm (the past). From there, the spell superimposed the etherial realm back into the Prime. Stopping the spell broke the etherial realm (and portion of the original prime) off and shunted you to the the anchor point, since you were in the epicenter of the spell when you broke it.
That other timeline still exists, and maintains Prime status. But it's flapping about, and may re-intersect in odd ways... and not necessarily in the same place.