Amnesia

The man loosens your chains. Then you whip back your foot smack him right in the nose with the toe of your boot. As soon as you make impact, blood sprays onto your shoe, and the man and his broken nose fall back onto the equipment. Sparks fly everywhere, and the room is plunged into total darkness. There is a short silence, broken only by a little flickery sound coming from the thing the man crashed into. All the time, you're slowly trying to wriggle your hands out of the chains. Suddenly, you're free, an you jump off the bed, run up the stairs and through a door. You end up in a corridoor going two ways. Which?