That animal is turned slightly in and his legs are pretty much square,that will lift the shoulder blade.
If he straightens up and steps forward with the near side leg,the shoudler blade will actualy drop,,,it won't lift until the far side leg goes forward and begins to cross the near side.
Similar things happen if he lifts or drops his head,,,,drops it to graze and the SB goes up,lifts it high and the shoulder blade goes down.
The range of movement is not a lot,and the area of the shoulder blade we're talking about is not going to slow down a good arrow much.On any deer my own choice will always be to shoot for just above the elbow,I just don't worry about the shoulder blade because IMHO you have to hit it pretty high for it to become a problem.