[SlackBrian]

The thing that sticks out in my mind about that scene was the mocking tone Loki said "sentiment" with. I don't recall any tears, but I can't say for sure if there weren't any. But his tone and attitude didn't seem to suggest a conflicted nature about what he was doing.

Edit: Just watched the scene again. Yep, there was definitely a single tear that rolled down his cheek after he stabbed Thor and said "sentiment". So, hooray.