That pretty much screams the Whomping Willow, which is mentioned by Rupert Grint in many of the videos. The Whomping Willow kills a bird in PoA. A life-sized Willow with KUKA arms for branches? That would explain why Teebin said this would be the most herky-jerky part of the ride. Dueling KUKA arms?! If that's the case, then that truly is amazing.