I'll Be the One Lagging Behinds, Right?

I've semi-agreed to go on a hiking holiday in a few months' time with some friends from school. I'm just worried that I'm going to feel the need to keep up with them. There'll be a couple of things will happen. One is they'll be disappearing over the horizon. That's the one, isn't it? The upwards horizon. It slops you from seeing space, isn’t it? And I'll be... I'll just be the one lagging behinds or ruining it for everyone.