If a person is drowning and near deep water. It can be dangerous if the aid is to help the victims or away from the shore. The apparatus. Where you are in the stand steady.
If someone drowned in deep water area by far and is potentially harmful if a helper to assist or victims away from the shore, using a device that allows you to stay in a stable where they are standing.
If the people in the water and the water depth by classy can be harmful if the Help is to go to the victims of the disaster, or away from the shore, using the device, you are in a stable, and stood.