When you hit then they have a tendency to dive and their tail flipper usually does the damage. That sounds/looks like what happened here. He hit the beast with his nose and likely got a whack from the tail fin in the daggerboard....
Here is some minor hull
damage from a whales tail fin:
And Prop Damage from the same incident:
I'm On point, On task, On message, and Off drugs. A Streetwise Smart Bomb, Out of rehab and In denial. Over the Top, On the edge, Under the Radar, and In Control. Behind the 8 ball, Ahead of the Curve and I've got a Love Child who sends me Hate mail. - (George Carlin)