User blog comment:Omega natsu2/Episode 200: Drops of Time, Review./@comment-24102956-20140920071026/@comment-7418318-20140920091838

Maybe that vortex works like Minerva's magic. She also abducted Lector and Millianna into another dimension, but when she was defeated the two somehow got out. Likely that other dimension just collapses when it's no longer fed by the mage's magic or is somehow interrupted in same way when the caster is knocked out and just dumps the hostages back to where they came from.