Wacky that they would put kids into the middle of what must be a choreographed machine movement, be like having them run through a bunch of factory automatons, hope you don't get caught under a drill! Maybe those robots got really good spacial awareness and avoidance routines in case a kid went off script into an area about to be filled with metal, or maybe they just have a higher risk tolerance than we would.
Really fluid movement though, CAN NOT WAIT until hollywood starts using them as stunt performers, imagine a fight scene or car stunt sequence with these things in there. Screw CGI, just make a fully articulated and controllable dragon/demon/sexy sexy succubus and go with that!