Originally Posted by jaqua99
I definitely saw it as him going to, like, some other plane
That's what I thought too. You can still see his physical body sitting there while his decked-out self talks to the other. His facial expression makes it look uncomfortable, like he's the one being drawn to another dimension/plane/etc.
And I would agree with the idea that Frigga saw Loki's potential for good. But I think her continuing to be supportive of Loki despite all of the terrible things he's done has more to do with the fact her love is unconditional. To Frigga, no matter what Loki has done, he is still her child.
The thing that was always saddest to me about Loki was that things didn't have to end up so badly. You wonder what would have happened if he (and those around him) hadn't made all the wrong choices.