There's a scene in Point of Honor where, on the day Fort Sumter is attacked, cadets from the South sit on the right and cadets from the North on the left. Pretty speeches, etc.
How did it actually go down? Were there fistfights, mass resignations, people skulking out, etc.?
Nothing like that. John Waugh's The Class of 1846 is a good source on life at West Point for the men who fought in the Civil War. He describes how the Southern cadets went home in small groups or singly, as letters reached them or news of their state's secession reached them. Some remained behind, and as early as April 1861, there was not a single Confederate-minded cadet there:
"In late April Truman Seymour went home to West Point, and on a clear moonlit night 50 cadets marched to Professor Robert Weir's quarters to serenade him. Seymour came to the window after a while and responded with a patriotic speech. 'We could see his features well,' said one of the serenaders, 'and he looked as if he had had a hard time at Fort Sumter. When he made his appearance at the window, the cadets applauded everything that he said, from beginning to end. But he would have been applauded if he had not said a word, for actions speak louder than words, and his actions at Fort Sumter had preceded him and endeared him to every true American heart."