Alec almost reached out to still Jace's hands but thought better of it. Sometimes his parabatai needed to move, even if it was just tiny little motions that shouldn't release a noticeable amount of excess energy. "If I didn't leave you during all the crazy things that have happened since Clary showed up at the club, why would I leave you now?"

Sighing, he rubbed the back of his neck, wishing he could make Jace believe that things were getting better. Even if Jace stumbled and made mistakes, he was still trying, which was more than what had happened during the first few weeks they were dealing with Valentine. "Trying is what's important, Jace. We're both going to mess up sometimes. That's part of being human."

Automatically, Alec picked up at the right spot for the duet, while scowling at his parabatai. "I do not need help kicking your ass. You might be more Shadowhunter than me, but I am capable of beating you when I want to."