DIA is a bit of a scary place to have that sort of event. The airport was built on rolling terrain and several of the runways were built up above the base level. An excursion could end up with an aircraft sliding down into a hollow, some more than 100 feet below runway elevation. From the video I saw it looked like the a/c turned, went down a small slope, back up, across a road or taxiway and then back down into the "ravine". Just lucky it wasn't the one with the fuel pumping station at the bottom...
Rob