I'm not so sure it's that difficult. It'd be tough to get over there from down past Dey Hall or from Raleigh Street by the Student Union, but it seems it'd be relatively easy to pop down from Lenoir Drive between Davis Library and the Upper Quad. So long as there's no service vehicle blocking the way as there usually is!
Yep, that's the way I was thinking. Depending on when he did this, I'm surprised he didn't take out a lot of people between Davis and Lenoir on the way to the Pit.
Was the Pit preacher one of the victims? I can see how he might have been a target.