Late in the movie ARQ, the two key characters escape from the sealed building they have been hiding in and we see the outside world for the first time. They observe a line of "petrification" around the building caused by the extent of the time loop created by the ARQ. The outside world looks like some apocalyptic, war ravaged landscape.
We know from the dialog in the movie that there is a major war going on and the outside world is dangerous and contaminated (people need gas masks to survive in it). But the characters know they have been in a time loop (though not yet how long that loop has been running). They choose to go back to the house rather than to escape their pursuers to try to rescue the ARQ. They eventually find proof they have been in the loop a lot longer than they originally thought.
Was the extent of the destruction in the outside world worse than they were expecting (implying they had been in the loop longer then they originally thought)? was this part of the motivation for choosing to rescue the ARQ rather than to escape?