I said this in yesterday’s posts that it was stupid that Jace and Clary go alone back to her apartment, because Valentine could have laid a trap. Then in this passage, it was made more than obvious from how quiet and dark the apartment building was that something wasn’t right. Then add in the blood on the banister, and the way that Clary’s apartment was empty was basically a big red sign signally to anyone with a common sense that shit was about to go down.
I know in the same situation, I would have taken one good look at Clary’s apartment and turned right back around and left. Yet, they just walk further inside like a bunch idiots, and you know what happens? They get attacked! JUST LIKE I FUCKING KNEW THEY WOULD! This is why Jace needed Alec there, but I bet you that no one will bring this up once they get back to the institute, they will just pat Jace on the back for killing the forsaken. I had it up to here with no one in this book exhibiting basic common sense!