Man, I take a day off BF to finish a project and this thread takes off like a wildfire. I'll try to answer a few of the questions:
1. I know its not a coaster brake because coaster brakes don't use track cogs. Also, the bike didn't have the coaster arm.

2. I go to a UC not a CSU, i commute to irvine.

3. I though about leaving a note, but i'm a pretty snarky person, and even if i tried not to, I'd probably come off like I was insulting the guy. My main concern was that either the guy was going to crash into me ( i usually walk around campus since its so crowded where I go I can't really ride at much more than a walking pace anyway) or crash into somebody else. Either way, it seems like the school administration would respond by not allowing bikes around most of the campus. Maybe I will leave a note next time.