Hovering landers like this one look as they are suspended on air because you cannot see the air and the heat from the thrusters. This video is taken with an infrared camera to reveal these forces. This is the second free test of the autonomous robotic lander prototype. During the first test earlier this month, the lander managed to suspend 7 feet high for 27 seconds completely autonomously. NASA states that the next test will be up to 100 feet high for a whole minute.
The infrared video allows engineers to see how the vehicle is behaving thermally as well as how the thrusters pulse during test since the thruster plumes are invisible to the naked eye.