I just look up a walkthrough to see how to beat the room. The solution was cheap and stupid. Really it doesn't make sense. The scanner does a really poor job at predicting path, and I honestly do not think that you can magically guess that there's a major difference between standing half-in-the-ground and directly-on-the-ground. I am only trying as this is a game of Terry, but this is really nonsense.
I think the game seems to expect you to learn things when you don't even get chances to. The fact that you have to repeat puzzles you have already beaten does not help.
EDIT: Finally beat the game. I wish the game started with the final area, as it's actually pretty awesome.