PROBLEM PLEASE HELP!!

So I'm on the part where the doctor is taken by the psycho after finding her notes...and i went in and saw him pulling her into the room, but i went back out the door and then i came back in and went to where you're supposed to lay up against the wall and throw a batarang at him and he isnt there....i can go in the room and like right when i walk in the room it wont let me walk through cause his body is there but its not there and i have to walk about the invisible him but he doesnt say anything its just all messed up and it wont let me walk back out the door and i have shut it down and restarted it....just wondering if anyone can help me without restarting and or have had the same problem with this.

if you can help message me on myspace myspace.com/mitchellmac

if not then on here will be fine just message my game thing cause i'll probably forget to read the forums.

thank you.