Under a dark and ominous sky, pierced by lightning, a man wearing a sinister hood summons a... "dragon"!  Shimoda and some of the designers were trying to fulfill the order "has not wings but flies anyway" and were checking out the dragon for inspiration. However, a harried looking Mizushima rushes onto the scene.
That's good. Hydrogen makes balloons float, too.
فكرةٌ حسنة، يجعل الهيدروجين
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Ah, gute Idee!
Damit fliegen ja auch Ballons.
Bonne idée !
Ça sert aussi pour les ballons.
Giusto!
Boa! Balões de hidrogênio também voam.
Точно. Шарики с водородом тоже летают.