Thor flinched when Loki snapped such words at him. Here was the Loki who had erected a golden library in Frigga's honor -- and so Thor had thought him above throwing her death in the face of her eldest son. He had let his guard down, in that much at least. So the wounds of his grief lay open and now aggravated, when Loki decided to mock them by calling Thor sentimental and blind.

Stalking forward, Thor grabbed at Loki's collar and shirt, shaking him once, harshly, before forcing himself to let go. He was shaking and panting with anger, hurt and frustration. He was giving his little brother the anger that Loki wanted from him. Even knowing that, it was a difficult anger to part with -- Loki was thoroughly in the wrong here, and Thor's pain was far too deep to allow himself to respond with anything but anger. Because Thor often used his anger, like his affection, to distract himself from his pain.

"I will do what I can, to prevent her youngest son from ruining his family. Loki... why?" What was worth this much to Loki?