He took the hit from the deer easily, but then turned about, crouching low for a moment, and growling playfully when the stag came at him a second time. He evaded that hit, and then took off across the grounds. He didn't hold back this time, but went all out, speeding through the grass and then through the trees. He didn't stop for an instant to see where Prongs, to check if he was behind him. He knew the stag could keep up.
There was a brief instant, an inclination that were more instinct than emotion, where he missed Moony, where he wondered where Moony was. The forest was Moony's domain in the end, and they all knew it, and the smells everywhere just made him want to go looking for the wolf.
But it was daytime, and that wasn't the wolf's time, so he contented himself with landing in a stream of water and then tucking down, waiting for the stag to come by.