Characters
Okay, sit tight, hold the fort, and keep the home fires burning and if we're not back by dawn, call the President.
— Jack Burton ‧ Big Trouble in Little China

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Instructions to wait and hold things together end with an extraordinary escalation: contacting the President if the departing group has not returned by dawn. The shift makes a familiar set of parting directions suddenly national in scale. The deadline gives that outsized response a specific trigger.
Context reviewed