WiththeirmominthehospitalandtheirdadMIA, they'reconfrontingthepossibilitythattheycouldbeleftwithoutparentsatall, whichisprobablythescariestconceivableideato a child.
"Satsuki, Dadwasn't onthebus!"
"He'llbeonthenextoneforsure."
Thissceneclocksinatalmostsevenminutes, whichis a significantamountoftimein a moviethat's justunderanhourand a halflong.
It's anespeciallylongtimetospendon a scenewithsolittledialogue, sothelengthcommunicatesthescene's importancetotheaudience.
Thetensesilencecombinedwiththerain, theincreasingdarkness, andthelossofhopeasvehiclespassbywithouttheirdadaddupto a sinkingsenseofdread.