^ Wha... How does that happen??? The gondola side of the arm is still much heavier than the counterweight, like this has to be the most freaky combination of perfect amount of momentum during a power cut off combined with perfect wind conditions etc for it to reach equilibrium like that. Never mind people swinging their legs moves pendulums like this more than you'd think (source, I go on an intamin gyro swing 3-6 times a week)
If it's not the perfect coincidence/combination like I described then the only other idea I can come up with is that Zamperla also puts a physical brake in their pendulum rides that might kick in to slow the arm down during an emergency stop, like said intamin gyro I go on regularly (the emergency brake is LOUD) but I wouldn't imagine that kicking in perfectly at the moment where it'd stop it upside down.
