Look closely at the legs of the players in this game action photo.

I've never seen anything quite like this. I believe the horizontal streaking, which wan't really there, is the effect of flash bounce off a very brightly freshly waxed gym floor (first week of the season).

As can be deduced from the background, this is a VERY poorly lit gym, where flash is absolutely necessary to get anything other than a black blob. The wax job was brighter than the lights!

I'd think getting a little higher so the flash bouncing off the floor isn't at such a flat angle would help. Any thoughts on this effect, or ideas on how to compensate for it?