Melding a copied meld pair
Hi Karel,
Thanks for your question. When you activate Battlement's ability, you exile the Battlements and the Garrison, then you check to see if the two exiled cards make a melded pair. Since they're no longer on the battlefield, they're no longer affected by Crytoshape, so they're back to being Gisela and Bruna. Bruna and Gisela make a melded pair, so they'll return to the battlefield melded. There's nothing in the rules that say that the source of the activated ability and the names of the cards in exile have to match up, so in this case, they would return melded as Brisela.
If the two exiled cards didn't make a melded pair (for instance, you had an actual Batttlements and a Gisela that's been Cytoshaped into a Garrison), then the two exiled cards will not return melded and will remain exiled.
Thanks,
Nathan Long
Magic Rules NetRep