I saw that video, too, from reading a BBC article. To see the buffalo come back and save one of their own was awesome.
While I fear that it's a longshot for the calf to survive the wounds that it took (the lionesses gorged the neck and the croc looked to have tore off a section of hindquarter), that is still an incredible display of nature, and a once-in-a-lifetime video capture. The person who made that video is gonna be rich if they sell their footage to National Geographic or something like that. Or at least they'll get some major recognition from said organization.