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TLDR: Your sensor's entire area isn't exposed by the shutter all at the same time, so using too fast a shutter speed with a flash results in only a fraction of the image being lit by the flash. Don't use a speed past your camera's stated flash sync speed (most modern cameras have it at 1/125 or 1/250) when you have a flash in use.
(or should it be TLDW? :P)
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Baka. Soku. Zan. - The justice behind the dysORDer.
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