Like the ending of The Blair Witch Project, but the kids walked into a cult concert instead of a cabin in the woods.
You may notice a barely-liminal flash of colour, about half way through. We slowed down the video and discovered a crescent moon with an orange triangle inside of it. Later on, the same occurs with a pink circle/green square combo. Significance undetermined (maybe cult emblems), though similar shapes do appear on the band’s Web site.
You may also notice that this sounds like a sinister take on a Concretes tune (video evidence below). “Radio” comes from Dark Horses’ 2012 debut, Black Music.