It feels like the festival’s only just begun, but the third and final day of Optimus Primavera Sound 2013 is already here. With it comes that bittersweet feeling one only gets when facing into the last day of a great festival weekend – there’s excitement for another day full of promising live shows, but also disappointment that it’s not lasting for another day at least. The only thing that can be done, though, is to make the most of the time that’s left. So, with a timetable in one hand and a beer in the other, The Thin Air sets…