You will.

[He's certain of that. Anything else is too terrible to comprehend.]

You will, I'll make sure of it. [I'll take care of you.]

We just have to finish what we were sent here for. [The hand that had been cradling Aziraphale's against his cheek moves to brush against the bracer on Aziraphale's wrist before he lets go.]

And if that doesn't fix it, then... Someone here's got to know what will.