i'm glad i didn't fell . but seriously these graphical glitches are all over this course. this needs to be fixed.
and one more bug report about this course - when you complete a few obsticles you can't either walk anywhere and you can't teleport anywhere, it says that you will be able to teleport after 10 seconds after combat and only solution is restarting a client, i think if i do this a couple times i would be able to do it again.