It's very important to understand that body language is very flexible in its meaning. Gestures need to be analyzed in concert with floor play.
Prime example - take the very common yet versatile
two-arms-extended-shoulder-shrug move. When my players are on offense in the paint, I'm sure this gesture means, "Aw c'mon, where's the FOUL!" But this great expression takes on an entirely different meaning at the other end of the floor when we are defending. Clearly, it means, "What? What was that? Aw c'mon, he hardly touched him!"
See - one gesture, very different meanings...
(coach sneaks back to the coaching box hoping not to get slapped with a T)