Great!
Very nice, smooth and interesting, this one made me watch the whole flash!! Like the previous guy, a series would be good, bit of storyline here and there, some backround info and you got yourself the makings of a series!!
A little side note, there was a bit of overcliche'ness with the part of the black walls coming up, not that it was a bad point but wasn't good either...
Well done, even though I hate cliches severely! You did this one very very well!! Hope to be seeing more of your flash!
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zForest