This video shows Lara Croft's imitating doppelganger and how to destroy her. This flesh girl mirrors Lara's moves on the opposite sides of the room. It's as if Lara is seeing a reflection of herself in flesh and bones. Pretty freaky. At times the doppelganger may not be moving; but that only happens after you load your saved game in the area. There's a trick on how to fix that.

Also, I forgot to mention something in the video; when you pull the switch to open the lava trap, it only stays open for about 40 seconds. So yes, it is timed; just so ya know. This is my favorite part of the game. :D