I've seen that, or at least a similar video. Bitch orcas practicing catch-and-release with a live seal to train their young how to hunt. Nature don't play.
I saw it on some nature show the other day. They said it's only been captured on film a handful of times. In fact I think there about 3 or 4 of the same video I posted on YouTube just different narrator
Coincidence....I'm watching a "what's trending" show right now, where they showed a going viral video of a baby seal jumping into the back of these guys' boat to escape orcas.