What is the grammatical structure in the sentences "So must be the "point of view".?

Hi, can anyone help with this sentence. Korean students need to translate it and need to know what the subject is? It is part of a waffle on how the narrator controls and directs a story, he imparts his point of view. They refer to a camera filming a football match, it offers its point of view, but you are free to scan the field for your own point of view. This sentence is part of the narrative on points of view and sounds really odd!