Spoilers!! under the cut.
@writernotwaiting replied:
Actually this is exactly what I thought–neither one of them looked at all worried that Loki wasn’t going to make it out alive; Thor just seemed to assume that Loki had buggered off somewhere else, and was frankly thrilled that he chose to stick with his brother, instead
You didn’t have the moment of “huh?” that I did before you arrived at this interpretation?