Update: Using TCL (no clip mode) cheat I can get outside of the box, but I am still stuck moving in super slow motion. I jump and attack at normal speed though. The guy at the beginning only tells me that there is no time to waste, even when I have grabbed the dagger and am able to clip out of the "box."
Final Update: It was a game controller that was plugged in. For some reason, it wasn't calibrated correctly and was controlling my character even though I wasn't using it. After calibrating the controller, all was well.