Here, the parents are escorting out of the area, an unwanted adult loon that may be a "prospector" . The chick is behind them and awaiting their return. A prospector has been defined as a loon that is looking to gain some of its own territory. We have no way of knowing if this is an actual prospector or maybe one of their offspring from previous years. In fact, when this happens, I cannot even continue to identify the two loons that are the parents.