Ugh, can't get to Dr. Young...
I just beat the game on hard like, an hour or two ago and I start over again so I can get all the riddles fresh from the start, but I'm at the part where I'm looking for Dr. Young and I can't get to her spot! I know I should remember this since I've already beaten the game, but I don't. it's in the Arkham Mansion, and there's three possible ways (I know of) to get to her. Ones in the main hall, but that is blocked by a laser wall, one's in the west wing corridor, but that has a laser wall, and the last is in north corridor, but the door is blocked! This is really frustrating, could anyone help?
P.S. if this helps, I've already been to the library, brought down the chandelier, and saved the hostages from the joker gas box.