Notice how it wobbles at the end? According to Urban Aeronautics, the vehicle's Flight Control System made the decision to land too early. Decisions by the flight controls are checked by the craft's flight management system, like a pilot overseen by a captain. These decisions are all informed by an array of sensors, including "two laser altimeters, a radar altimeter, inertial sensors, and an electro-optic payload camera." Lots of other unmanned aircraft use some combination of these sensors, but few have the unique design of the Cormorant, which puts the rotors inside the craft.