If you're going to fall down stairs then be as cool as you can about - just like this guy. He manages to trip, role and go head over heels before land at the bottom of the stairs on his knees. He then simply gets up and calmly walks away as though nothing has happened. I'd say this was a set, performed by someone who knows how to fall - why else would he be coming down stairs that are cordoned off at the bottom. Fake or not it's still pretty cool.