Todd, along with the head movement, the left hand signal, it looks like you might be working a little too far back, and too high! In addition, it appears that you body is not squared up to the pitcher. You looked like you were slightly shifted to look into the zone.

I would suggest working a little closer to the catcher, spreading your feet out much farther, and getting squared up to the pitcher!

Tell your partner that he is not a bird, and that safe calls should be done at shoulder height, not above his head!