cfr,
That set of vids is really impressive! But in fairness, listen to the sound track carefully, you can hear the pilot exceed torque limits, pull the rotor rpm down very low, and then run out of pedal control.
This, like the Sky Crane, is actually "over pitching" and not LTE.
In LTE, and otherwise normal situation goes to worms purely because the tail rotor cannot deliver the control like Blenderpilot's film. In overpitching, the cause is the rpm loss, that symptom is the yaw control problem.
In Blenderpilot's case, he had lots of power, enough to swamp the tail rotor while at full rpm.