Is this a bug?

[GraphicsKid]

I'm in the weird dream place where the hive mind thing is testing me. I'm at the 3rd challenge (with the stone blocks and the pressure plates and the doors) and after playing through it a few times, it keeps going back to the spiral staircase place as though I'd died when all I did was hear the guy die, and walk forward a few steps. Other times, it'll "kill" me if I just hear the guy die, then touch the stone block. It didn't do this before.

Also there's a few graphical glitches going on as well. (weird distortions in the upper left hand corner of the screen and I keep seeing a weird fog covered pillar in the distance, but it moves with the view, not with the world, and it is clearly not supposed to be there.

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Since I've got nothing else to do right now... a video of the problem (the graphical glitches cleared up after I restarted the game).

http://www.youtube.com/watch?v=PqkUKMb5WP4

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Nevermind I'm an idiot!