Originally Posted by Silvermoon
Yeah, that's always been my belief, that the journey through the portal was not a pleasant one. If I remember correctly, in one of the children's/junior novelizations that covers just the first part of the movie (can't remember which one). It describes Loki's arrival more as him having to claw his way through the portal (really wish they had done a visualization like that).
There's also, perhaps, this interview that could be taken into account as well:
With that being said, then I assumed wrong when I first saw the movie, and I bet Thanos didn't have any sway on Loki's "imagined slights" as Thor called it. Going through hell basically he was gnashing and weeping to his own self and convinced himself that Thor had let go. Man, I wish they'd get deep like this and even deeper in their story telling in Phase 2, now that all the origin based stuff is done.