How does the point of view change in Chapter 83, and what new insights does it give?

In Chapter 83, the author chooses an interesting point of view change in mid-chapter. When Sophie, Langdon and Teabing are trying to enter the Temple Church, the author switches to the point of view of the altar boy, a new and unknown character in the book. Up to this point, the author would typically maintain the point of view throughout an entire chapter. With the change in point of view, the reader gets to see Teabing, Sophie, and Langdon through a different set of eyes.