The thumbnail image for this video has been updated - thumbnail added by oritteropo.

The thumbnail image for this video has been updated - thumbnail added by vaporlock.

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).

I'm not exactly certain what you're getting at. Those who reported flowing or dripping steel had most likely seen molten aluminium. Those who didn't mention that the substance was moving in any way had most likely seen either molten aluminium or simply oxidised steel.

The National Fire and Arson Report (Volume 10. Number 4.)

Recent studies performed in our laboratory indicate that it is not possible to tell by visual examination alone whether a piece of steel has melted or merely oxidized.

"Indicators of Trouble" by John J. Lentini, CFI, F-ABC

A study of the 1991 Oakland fire that burned 3,000 homes revealed the presence of melted copper in over 80% of the burned structures, and what appeared to be melted steel in over 90% of the burned structures. With respect to steel, looks can be deceiving. What appears to be melted may be merely oxidized.

The CFI yelled at me about it, I'd done a few hundred landings by then and she thinks I pressed the right brake hard on landing?? Yeah thats what I did, the wheels touched down so I decided to smash the right brake to the floor. Puh-lease. My CFI's generally were pieces of crap, had to switch them every week or two because they kept leaving or generally flaking out. I came to the conclusion CFI must pay one notch up from fast food.

I wont forget the first instructor though who had > 5k hours and was superb in every sense. Except once he solo'd me (13 hrs in) he took off. I think he liked to solo people and then leave. He taught me a completely different method for crosswind landings though than every later instructor.

Most exciting flight school moment #2, a Piper cub crashing in front of me when it couldnt make it to the runway. Most exciting moment #3, a plane flying faster, under me, while I was on final approach and taking my runway. Most exciting moment #4, my CFI (probably the 5th!) following VOR radials with me under the opaque hood, and almost colliding with another plane (( from the SAME flight school )) at 2000 ft! Talk about a clusterfu*k company. (The 2nd flight school I went to.) Most exciting moment #5, grabbing the mixture knob instead of carb heat and killing my engine mid flight over the middle of Anchorage (no big deal but exciting having no motor running) . Most exciting moment #6, my first solo flight, and the tower comes on and starts giving me bizzare new pattern instructions I've never had before.