"Well.. I guess it's true that it's not like there's a whole lot of sand on the train to practice with." As if that's the main issue keeping a more-than-fully-grown adult from making sand castles, Madoka!! But she smiles. "Don't worry though, sir. This is the perfect time to practice, right? Before you know it, we might end up in a world with a sandcastle building contest, and then you'll be prepared!"
There might be a tiny bit of a joke to that, but she mostly actually seems pretty serious. It wouldn't be the weirdest thing to happen to the train at this point.
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"Well.. I guess it's true that it's not like there's a whole lot of sand on the train to practice with." As if that's the main issue keeping a more-than-fully-grown adult from making sand castles, Madoka!! But she smiles. "Don't worry though, sir. This is the perfect time to practice, right? Before you know it, we might end up in a world with a sandcastle building contest, and then you'll be prepared!"
There might be a tiny bit of a joke to that, but she mostly actually seems pretty serious. It wouldn't be the weirdest thing to happen to the train at this point.