[Armin notices the moment of silence and decides to leave the subject of why it fell for now. That sort of pause before answering usually means a more personal relationship to the story shared. Perhaps Hope had lost someone close to him when it had fallen. At least, Armin can't imagine something the size of the moon falling down on earth without a lot of casualties. And considering he has only just met this person, he certainly doesn't want to prod at anything too personal.]
So, you were able to explore both Grand Pulse and Cocoon?
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So, you were able to explore both Grand Pulse and Cocoon?