lordstormageddon:

Even after he releases Thor, unsure of his survival, trying to prove that he really does not care what happens to his “brother” or any other being, that he has completely removed all compassion and sentiment from himself, he shows no pride or pleasure from doing it. No smirk, no satisfaction, no relief, nothing. If anything, he shows remorse and regret for having to do it, as if he is actually attempting to save Thor from a fate worse than death, and that is seeing his brother become a monster. As Coulson observes, Loki “lacks conviction.”