Magnus might have Alec’s heart, but he understands that Jace is his brother. And that’s why he’s willing to do whatever he can to help Jace.
Now that Lilith has her claws in Jace, Alec is the only one who has a chance of saving him. EW has an exclusive Shadowhunters sneak peek in which Magnus and Alec discuss the plan. In order to bring Jace back, they have to use the strongest connection possible to him, which means his parabatai bond with Alec. But by using that bond, they’re putting Alec at risk of falling victim to Lilith as well. It’s a risk that Magnus doesn’t like, but it’s one he understands that Alec needs to take.
In the clip, Magnus tells Alec that he doesn’t want to lose him, but as Alec tells him, without Jace, he’s nothing.
Shadowhunters airs Tuesdays at 8 p.m. ET on Freeform.