User blog comment:Water Dragon Slayer/DREAM BATTLE CHRONICLES: EIGHTH MATCH!/@comment-5268982-20130905141641/@comment-7418318-20130906120123

If they either come out with the same direction and speed they had when they were entered this space or if Minerva can send them flying, rather than just making them appar, Minerva can easily use them as her own weapons. Particularly since Ultear's ice creations were probably covered in thorns, juding from her attacks against Gray on Tenroujima, so they'd need less momentum to cause damage than blunt objects.

And unless that magical space is very hot, I think the ice would hold out for a few minutes.