It is simply fascinating to see an adult dog teaching a puppy how to "communicate." Watching them do the faux battle is like a carefully choreographed dance. For now Denali is always way ahead, understanding the action and reaction associated with all of her moves. She leads Sage through the dance, allowing him to learn just a little more each time.
Because Sage is so young he still has his Puppy Pass. Denali lets him get away with things that definitely won't fly when he gets a little older. He's a smart little boy, and she's pretty bright, so it will be interesting to see how the relationship changes as they mature together.
There are so many subtle messages sent. For example, I didn't even realize that Denali was licking her nose till I saw this photo after-the-fact.