I think your imagination has enhanced that video a bit. The aquarium is the one in Seattle and the sharks were rather small (3-4 foot). The video shows a GPO killing a shark but I am not clear as to whether or not it ate it as the mystery that prompted the video was the finding of dead sharks, not eaten ones.
Thanks for the link! Monterey, it seems, has now kept a young great white shark not only once but twice! The first in 2005! Albeit, they were young sharks and freed before becoming adults but their tags showed that both lived after release.
I thought it was too easy to fall behind in IT but it seems almost everything changes faster than I can keep up any more.