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But individual shootings are not that unusual. And colleges don't put the whole school on lockdown because of a single shooting.
The first shooting today, appears to have been a single shooting. Ergo the college, even if they knew, wouldn't have a reason to lockdown the whole facility.
A few weeks agon there was a single shooting in the dorms at UNC Greensboro. It was the typical beater drug deal gone bad is only noteworthy because it involved the son of Sidney Lowe, the NC States Wolfpack Basketball Coach. If you don't live in Greensboro or Raleigh you probably didn't hear about this shooting. Of course the victim didn't die, but that's another issue.
So At Va Tech, the simple fact of a single shooting early in the day is probably not a good enough reason to shutdown the whole university.
In either case, Universities generally have bulletproof policies to cover everything. They are automatically not liable for the behavior of their students. That's what cops are for. And just because they assume in loco parentis doesn't mean they guarantee your safety. How could they?