More than even the final mission for any of the Houses, this is is the one that really stayed with me. Besides the amazing soundtrack (something that most levels had), it was the fact that instead of a load of generic enemies, the field was littered with students that you met and liked in the Garreg Mach days, and in this mission you're forced to kill a bunch of them to win. Bernie in particular, she deserved better.
Between Heaven and Earth is a great name for a scene, have I mentioned that? I think my favorite part of this song begins around 2:05, it's around the time I find myself trying to whistle to the beat. Then I'm stuck in for when it loops...