It is kind of messed up that the campus and police couldn't stop him during the second rampage. But, let's some use logic here. The first shootings were early, and chaos took over in the dorms. No one knew who did what. The guy was only packing some hand guns then, so if he was on campus it would be difficult to pinpoint him, especially with the chaos from earlier.
Campuses are ****ing huge, with lots of shortcuts and open buildings. Some buildings on my campus are all but empty for some portion of the day, but the doors are still open and such. It would not be hard for someone to just be walking from building to building.
Also, CNN has THE worst ****ing headline ever. I hope someone loses a job over "Students Slaughtered".
I hope the families and friends can keep strong, and the students keep their school and work spirit up.