I bet there was a problem with the pilot and never in life could this be called ground resonance.
Looks to me like the pilot wasn't able to grab the controls right for a time. Reallys sure he and not a pax was initially on stick and pitch? May be they unloaded the doc and leaving the patient alone on the controls?
BTW, why do they unload the ship in the middle of a rooftop on full power?