[Now, Rin didn't know a lot about making swords, but he had read a lot of manga. And when the main character broke his sword, the blacksmith pretty much threw it in a fire and - tada! Insta-sword and dramatic reveal about how important sword making was.

Rin stuck his hands into his pockets as he took a look at the sword materials.]

That's because you're tryin' to make a sword with a rock. You need heat or something to even make the blade stay. [Unless he was going for the cave man look, then he's got it down pat.] ...Or you could tie a better knot.

[Rin was pretty sure he was giving good advice.]