As I have been recently reading the books and short stories that comprise Eric Flint's 1632/Ring of Fire series, I have noticed a narrative style that I have not seen before.
These books are written with omniscient third-person narrator, but unlike a traditional narrator that maintains a consistent style and tone throughout the work, the narrator will change style to be similar to the characters that are in a given scene or chapter. This style change can be seen in details like word choice, complexity of sentence structure, formality/informality, profanity, and what figurative language is chosen.
This is not an unpleasant technique once one gets used to it, but I do not recall seeing it in other fiction, either classic or contemporary. Is there a descriptive term or phrase for this style?