Kerrang spoke to frontman Alex Gaskarth about the track.

This is interesting, because it’s in a very weird time signature – I wanna say it’s in 13/4, which is really odd! You get a bar of six, and then a bar of seven, and it keeps alternating. Basically, it was an exercise in writing guitar parts, vocals and melodies that fit to this hiccupping rhythmic structure. It was a way for us to do a little math (laughs) – and when you’re in a pop-punk band, you don’t often get to do that! I also really like the subject matter, which is about these people who exit your atmosphere, and then come back in and it kind of rattles your entire world. You realise that you never dealt with those feelings when they disappeared. It’s a cool topic, and a cool bed of music for it to live in!