A few questions : I'm not sure of why did the robot stop ? Is the robot controlled by the tablet we see at the top ? It seems a human that is not the robot o

A few questions : I'm not sure of why did the robot stop ? Is the robot controlled by the tablet we see at the top ? It seems a human that is not the robot operator panicked and pressed something (on-screen emergency stop button ?). Did the robot stop because it detected an excess force/failure to reach position, and is in fact not stopped and trying to reach position (aka crushing finger till the claw reach its closed position ?). If e-stop was pressed, what would have happened if no-one pressed the e-stop ? would the kid have been dragged across the board then released a few seconds later when the piece would have been dropped ? How much force is there in the claw of this robot ? What happens when the e-stop is pressed, does the robot fall limp or does it hold position with power in the motor or does it hold position because it is not back-drivable ?