In the first clip your shot barely missed the concrete barrier and went through the bush on top. I'm guessing there was some poor sap standing in the wrong doorway at the exact wrong time on the other side. Either that or it was just horrible lag and you shot someone who never appeared on your screen. Who knows with the crazy lag that happens in Crucible but I'm guessing my first theory is more likely.
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Makes sense to me! That was my thought initially, but either way I still thought it was nice surprise to get a sniper kill like that :P