I'll do the caps as soon as I can...
Possibilities for the M/B go back are endless, but the vid says GET OUT OF ARGENTINA
Are at the wrong airport in BA, have to go to another
left something at the travel agent, have to go back (IF that is in BA)
Didn't get right boarding cards for the ongoing leg, have to go back
Since they made it to Argentina, this should not involve passports, anyway!!
etc....
Flights are limited, anythng major could have put them a whole DAY behind, and we know that is not the case...