I mean, but that's what the rest of the season is for right? This episode was merely a setup in order to describe the event/scenario, and we can only presume that the next episodes will dive more into detail to dissect the situation. The event already happened, we know what happened start to finish. It is precisely the details of 'why' that this season is after.

And correct me if I'm wrong, but I am pretty sure it was daylight the next morning when they spotted him in the desert.