As I understand it, a person cannot be arrested for "violating" a campus lockdown order. It's a safety advisory, sort of like the one that says stay off the seawall during a hurricane.
On the other hand, a person could expose themself to unwanted police attention for being outside during the lockdown. They can make quite free with RAS during the lockdown.
Adhering to a locldown order does seem to violate the "3 stupids" rule: don't go stupid places with stupid people to do stupid things. Leaving the area does souind like a reasonable move - but then the folks who issue lockdown "orders" are, by definition, not reasonable.