The ChemCam is a fancy camera with an in-built laser, the camera has a telescopic lens. ChemCam can be used in a few different ways. It can zap a rock with its laser which generates a small flash of light, the flash of light has different colours depending on the minerals in the rock, that helps the science team understand what the rock is made of, it can also check the sunlight reflected off the rock without using the laser but that is less accurate. In this case they did not use the laser or the reflected sunlight, they just pointed the telescopic camera high up the mountain and snapped a series of photos of some really rugged terrain that the science team hope the rover can visit one day in the future after it drives higher up the mountain.