This buck is running downhill for speed and to the woods for cover. Whitetail fawns start to practice their acrobatic survival skills when they are only days old. They will use their flimsy looking fawn legs to suddenly jump straight up in the air, maybe twisting in the air and landing at an angle, then lowering their heads like they have horns and are challenging an opponent...then it might be over, or the fawn might pop around escaping an imaginary predator for quite a while.
Then the time comes, and it doesn't take long, when the young fawn discovers speed...it will sprint, flat-out, close to the ground, suddenly change direction and run some more. If there are no playmates to frolic along it doesn't stop the fawn, it will sharpen its life-saving skills by itself.