It hurts to see. All that loss, all that pain he never wanted his nephews to have to face. All the harm he wanted to keep them from but has no right to, no chance to.

"I need you to listen to me." Thorin holds his nephew's gaze, steady as he can be, and keeps his hand on Fili's shoulder.

"This place... or whatever is down here shows us what we fear most. What will hurt us the most. But it is not real."