Oh dear. Thanks for letting me know--it looks like the link is missing altogether from the .pdf. That's unfortunate, because the video really helps demo the drills described in the article. Argh.
Anyway, it's at http://media.crossfit.com/cf-video/FormDrills.wmv
I'll get it added to the .pdf as well, so it's there in the archive and for anyone who hasn't already downloaded the issue. (Or re-downloads it once the fix is in.)
Big apologies for the omission.