"The Underground. Ominous sort of name . . . "

And then he, too, sees the captive, though the captor is not clear. Kate's eyes show that she is accessing her power, and therefore there must be reason to do so.

Curufin reaches behind him and whisks his sword out of its sheath. A white flame licks up the blade as he raises the level of his own power. He'll take his cue from her, though -- this being her world and not his.