Because railguns are the shit.
[spoiler]This thread is not serious. Contain the flow of anger from your butt. It's just a fragment that broke off and accelerated faster than the rest of the meteor due to decreased drag. I think. Shit, maybe it really was a railgun...[/spoiler]
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Railgun rounds go super sonic. You wouldn't be able to see a round if without a REALLY expensive camera.