I see the hard bump, the oscillations, and then an attempt to force the chopper to ground, so all the conditions are right for ground resonance, but is there a chance this is dynamic rollover?

Looks like ground resonance that lead to dynamic rollover.

http://en.wikipedia.org/wiki/Ground_resonance
for the lazy

As a [working] helicopter CFI-I I'm gonna say this is Dynamic Rollover. If you watch you can see it looks like she is landing on a raised platform (i.e. a cart). You can see it looks like the front porition of the left skid falls off the cart (you can see it fall, and she just sits there, as the collective is full down and lift is not greater than weight at that point) with a twisting motion. She then decides to try to lift back up and reposition.
It looks [to me] as if during the twisting motion, she gets the left skid stuck on something and now has the holy trinity of Dynamic Rollover (Pivot point, rolling moment, lift grater than weight).
The rate of roll is also consistent with Dynamic Rollover. If it was ground resonance, getting the air craft back into the air is the corrective action and the problem should have been solved, but she tried to lift up, and the helicopter rolled, pointing me to think it's dynamic rollover.
Also of note is the lack of vibration in the main rotor, and main rotor mast. Which should be seen in a ground resonance situation. (i.e. here and here).