Hello I am Ariana! I love your books but I had a question about Clary’s dream were she was about to cut the rune that Lilth put him? I was wondering if that rune bounds Sebatian and Jace together why didn’t they cut it off?
Possessed Jace wouldn’t have want the rune damaged, so Clary would have been on her own mutilating it. Because of the connection, Sebastian would have known instantly what was happening and stopped her.
When the rune was mutilated by Magdalena and Jace was free, neither Jace nor Clary wanted to cut a giant piece of skin off Jace’s chest. The wound from Magdalena was only effective because a very powerful magical weapon made it. Jace was already healing. At any moment, the link might have reestablished itself. If they tried to make the injury worse, they’d be doing it with normal weapons, ones without the properties that allowed Magdalena’s dagger to break the connection without Seb knowing.
If they had chosen to, could they have sliced a big hunk of Jace’s skin off before the connection reestablished itself, thus freeing him? Possibly. But it would have been a gamble, and if Sebastian caught them in the act or just after, with Jace bleeding from a massive chest wound, odds wouldn’t be good that they could flee with the mortal cup or fight their way out.
If Clary had let Jace go, and they performed the operation in the Silent City, that might also have worked. We’ll never know for sure, because different choices were made. Clary thought the Clave would kill Jace, so she didn’t let him go. She always gets flak for that, but she was right. If she’d let him go, he’d be dead, and nothing would have turned out any better.
Timing, everything is timing!