User blog comment:Gardimuer/BioShock Infinite Demo & Screenshots/@comment-3042051-20100924025352/@comment-2250991-20100924030925

This kind of demo is the type that just demonstrates the initial concept of the game, rather than be playable. Halo 2 and Killzone 2 had similar gameplay demo videos before, where most of the gameplay was scripted. keep in mind, this game is still in development for about two years, so it's going to be gradually different the next time it's unveiled. Although there were scripted elements, they did mention that the building with the bell was something they didn't expect to crash like that.