i'm thinking there is a bug in the blue amibs. when you cross the bridge to the light house and go to the 2nd floor and back by the wall when the bridge is you fall down to the 1st floor and get stuck for a second... i was doing an amib last night and this happened 3 or 4 times when i tried killing something. if you want you can ask Pirul because he was there too and he fell a couple of times too.
This is an intentional feature of the lighthouse. Passing through the doorway will teleport the player to the bottom level of the lighthouse structure.
