Then he moved, so quickly Alec didn’t have time to react. By the time he saw what was
going to happen and darted forward to prevent it, it was already too late.
There was a crash—the sound of shattering—and a sudden spray of broken glass like a
shower of jagged stars. Jace looked down at his left hand, the knuckles streaked with
scarlet, with a clinical interest as fat red drops of blood collected and splattered down onto the floor at his feet. [,,,]
“Because.” Alec retrieved the blue bottle of antiseptic. “I think it would do you good to
feel the pain. You can heal like a mundane. Slow and ugly. Maybe you’ll learn something.”
He splashed the stinging liquid over Jace’s cuts. “Although I doubt it.”
“I can always do my own healing rune, you know.”
Alec began wrapping a strip of bandages around Jace’s hand. “Only if you want me to tell the Penhallows what really happened to their window, instead of letting them think it was an accident.” He jerked a knot in the bandages tight, making Jace wince. “You know, if I’d thought you were going to do this to yourself, I would never have told you anything.” […]
City of Glass by Cassandra Clare
Chapter 6: Bad Blood
Oh my god, I just want one relationship familial, platonic, or romantic to actually be fucking healthy for once! Seriously, is that too much to ask? Yes, Jace was a stupid ass! He was angry and instead of taking out his anger in healthy ways, he punches the window where there is sure to be a lot of shards embed in his hands now.
However, that does not make what Alec is doing right.
He is letting someone suffer for a prolonged time to “teach them a lesson’. No, teaching them a lesson is giving them the silent treatment. This is just plain cruel on Alec’s part. And if being a decent person is not good enough, then he should think about the practical elements then he should think about.
Alec knows that trouble is coming, which will probably culminate in the fighting in some way. It doesn’t take much to put everything together and figure it where this all going. With Jace’s hands out of commission, he can’t wield any weapons, especially not any swords or blades. Alec is essentially disabling Jace in order to prove a point.
This is not the sign of a healthy relationship! They can’t just talk it out and let it go. No, they got to blackmail people and cajole each other to cooperate with each other. This is not a good sign for the longevity of their friendship soulbond or no.