No, not "Rampage" at all... Hippo's sometimes do that... i.e. chomp canoes in half just to show who is boss.
Rampage would be charging into human camp sites and tearing everything in sight.
What puzzles me is why people are not told of this before they get into the canoe/boat.
Hippo rampage? Pretty class-less coming from an organization that I hold in a high regard. Animal behavior is complex, just because people get hurt in animal encounters does not make it a nefarious action on the part of an animal. Pretty lame NatGeo, pretty lame.