Its hard to keep track of an entire campus with 2 people, to have them be in the right place at the right time would be at best 1/1000 chance. I know this is a difficult subject for people to know wth to do with.
Fact is though, there is nothing stopping anyone from grabbing a rifle, heading down to whatever location they choose and going on a spree. Waiting for the SWAT team to show up 10-20 min later is also too late. The damage would already be done. Just like at VT.
If you're at school and this takes place, wth would you do other then run/hide & hope you're not found? if you're out gunned, you dont exactly have too many options. You get out of the line of fire, or you get hit.