Pyro is the first sing speaking to Scott

You are glass, cold and brittle So I never push too hard 'Cause you break from so little And I cut myself on every shard I wish that you were clearer And could see my point of view

Scott litterally being cold, but also brittle is how soft Scott is, he want to help everyone, not even thinking about leaving Tegrith and dealing with Percy.

Pushing to hard you can see that as Pyro tell Scott he was leaving the first time. then he get conformation of how Scott 'breaks' after Pyro tells him the second time

he wishes Scott can see 'his point of view' he want to leave and make a legacy to be know not Stay in the boring town of Tegrith.

Second is Scott You are glass, thick and blurry So you see the worst parts first You're a pane and I worry That your temper's always primed to burst You wish that I was clearer And could see your point of view But if I'm glass, then I'm a mirror So you're seeing only you

Pyro doesn't really thing good of most people, like Tim, he mostly judges people on usefulness and Reputaion.

''Temper' Scott mentions that their fight about Tegrith was good in comparison to others.

Scott is a mirror because he also want Pyro to desperately understand why him and Pyro's Family are mad and disappointed in him. he never, or very little, writes and never visit yet expect to be welcome back with open arms.

Noone really notices Scott is missing a finger, the only one who really does notice/already know is Pyro. Scott can basically do everything fine, with him not having it most his life so it normal the only thing he struggles with is writing and fine work sometime but that is mostly because of the tremors.

Pyro when they were kids used to write notes and other things for Scott when the tremors got bad.

The tremor were made worth by anxious it not as bad as it was but it still one of the ways Pyro can read the very expressionless Scott by watching his hands. Scott at first was very annoyed about the tell but as they make up he gets less annoyed with it.