[At least the tune has backed down from murder. That's a step forwards.]

[At this point, J is fairly certain of two things: that Frisk did talk with Sans, and that they got through to him somehow. Why else would Sans be so protective?]

Y'know, I don't actually know what to say. [It's flat honest; he's stymied.] Everythin' I could tell you falls under that whole secrets thing, an' after everythin' you've been through, you got good reason not to trust a stranger. [He makes a small, shrugging, helpless gesture.] So, honestly, I dunno.