You are standing on a timber floor of the 1st floor of the north-east tower looking south.  There is an opening but I don't know where it goes!  You have a narrow slit window to your left and rear.  There appears there may have been a wooden staircase to your left.  This is digital view created by distorting a still from video. 

You can go right into the 1st floor main room or left down the timber stairs.