I tried level five from the start and am stuck in the same spot.
You can't pass the Crows by, they just yammer in your face when they're nearby.
If you step on a purple square, the lever which turns to create stair ways and openings becomes inactive.
I was sailing along on these puzzles till this one. Time to search the net for a solution.
Note: I found the solution. I did not see the possibility of it. I was able to use the same trick in the next bit of the puzzle as well so they won't fool me again. In this particular way.