Sansa looks in the direction Jared is pointing. She doesn't know precisely what she's looking for but "metal" and "box" are things she can comprehend even if nothing else about this place seems to make sense with the things she's learned in her life back in Westeros. She gives him a quick nod; from this angle, it certainly appears it might be a metal box and therefore possibly this control panel.

"I think it is," she shouts over the water. "Let's make our way there! We'll need help to get through the vines, I think, so we'll need to go together."

Sansa has the feeling that the vines will constrict even more if they stop moving and she thinks they need to go together no matter what. No matter what happens, she will stay with Jared because she likes her chances better with him than without him. She starts moving toward the box, hoping he'll follow.