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If pressed while not in an intelligent flight more, the Mavic will engage "emergency braking." If pressed while during intelligent flight modes and Smart RTH these modes will be cancelled and the Mavic will stop what it's doing and hover in place.
No need to fear the button, in fact I recommend trying it out while you're out next so that you understand it, never know when it might save your Mavic flying into a tree while using active track.
More info can be found in the manual here