I wonder what the problem was. The article states that the robot first ran over the child. Are the sensors scanning only too high? How does it avoid low obstacl

I wonder what the problem was. The article states that the robot first ran over the child. Are the sensors scanning only too high? How does it avoid low obstacles then? At the peril of sounding heartless I’d say that it is quite probable that the kid ran into the robot because they were not watching where they were going, it has happened to me several times that a kid ran into me from the back.