As for the shot idea, to my mind, plot suggests camera move here as well .
The idea is to further emphasize the relationship between two characters and embody it via camera move itself.
From "aliens point of view" camera moves and stays with main character's "toymakers point of view".
It is only symbolic, camera never moves directly from allien's supposed head, in order to avoid crazy camera kinetics.
It looks like all is serving to us: the shot not only concludes the trailer but also ads a dynamic finishing to it.
( also if you went back to the animatic and listen to the closing shot sound track, it fits as well :D )