User blog comment:Omega natsu2/Chapter 372: Breach, Predictions./@comment-4489126-20140214163137/@comment-7418318-20140214165642

Maybe Cana can only "un-card" a certain number of people in one go and this was just the first group that got released, with the rest will being in the cards.

And if I was her, I'd keep the injured and non-combatants in those cards. With the gravity pulling the Exceeds down, letting one of them evacuate those still in the cards seems out of the question, but in the cards they are probably saver.