Track

My interpretation of a Tracking Shot is when the subject(s) usually a person/people or a vehicle is followed (the camera is on the move as well) with it being the main focus of the scene, unlike a dolly shot a dolly/ rails are not needed to shoot a Tracking Shot.

I believe this technique was used in the above scene to emphasise the movement of the two characters on screen, the movement the camera along with the two characters displays more realism in the scene, shows the distance that they have walked more accurately and also displays more of the scenery. The fact that a dolly is not used simulates the action of walking as the camera shakes bobs up and down. This results in a more believable scene and that the cast remain the main focus of the scene but at the same time more of the set is on display as opposed to with a still scene.