I was the other observer in Iambeast vs Flames0910 and I wouldn't say he did anything suspicious to accuse him of cheating.
First of all, when he was moving his army out, he sent a reaper to the watch tower which revealed your expansion. If you watch the replay it should be clear that your expansion was detected by his reaper.
Second, he saw your void rays early in the game. As any players would do, he put turrets down by his command center and by the barracks up front. I don't this it had anything to do with your dt.
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