A new video from a Tesla demonstration in Miami this weekend shows the company’s Optimus humanoid robot taking a concerning fall, with hand movements strongly suggesting it was being teleoperated by a remote human operator.

Electrek reports that Tesla’s highly touted Optimus humanoid robot suffered an embarrassing setback during a public demonstration at the company’s “Autonomy Visualized” event in Miami this weekend. In a video posted to social media, the robot can be seen handing out water bottles to attendees before suddenly losing its balance and tumbling backward.

But it is not just the fall itself raising eyebrows — the specific hand motions Optimus made on its way down are a telltale sign to robotics experts. Just before hitting the ground, both of the robot’s hands shot up to i

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