That's if it didn't plug on the right side of the machine, where the concave will not open for relief. Typically, STS's are not prone to plug except high moisture conditions. And, the most common location for an STS rotor to plug is on its right hand side of the threshing segment of the rotor. This is because of the rotor's rotating direction is to the right and the concave adjustment is on the left hand side (sides determined by the operator sitting in the seat facing forward). An STS's have also been known to plug when material builds up around the tailings return auger above the rotor, sometimes resulting in the ejection of the tailings return auger and tube. It's probably safe to say that the video was not a Deere sponsored video is it were featuring anything other than personnel and products walking on water!