[Omega Man II]

Joe Aust, who shared Room 2121 at Harper Hall with him, said he had spoken to Mr. Cho often but had received only one-word replies. Later, Mr. Aust said, Mr. Cho stopped talking to him entirely. Mr. Aust would sometimes enter the room and find Mr. Cho sitting at his desk, staring into nothingness.

“He was always really, really quiet and kind of weird, keeping to himself all the time,” said Mr. Aust, a 19-year-old sophomore, who, though finding Mr. Cho strange, had not thought him menacing.

Sounds like the ideal roommate to me...

[at bay]

Actually, his moron of a rommate was the principal reason any of this happened. His political ultra-correctedness led him to believe Cho’s behavior was acceptable. “Perhaps his culture is such that no one speaks to one another.” He has openly said as much.