I would reshoot it again as Mark says you will notice the drop in quality in that particular scene compared to the scene before and after it. I think there is another problem aswell. Whenever you rotate a photo in say Photoshop you lose a bit around the edges and a similar thing will happen here, you get the black background showing and you don't want that. Would it be possible to beg or borrow a tripod in future, even just for the day?

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