Face coloring!
Usually (not 100% but almost) in a conflict when the face is read it suggests anger but if the face is pale is suggests fear but he still may fight. I remember a saying in the academy to help us remember a first aid rule when someone was down, “if the face is red, raise the head, If the face is pale raise the tail”. heh heh I am not sure about this but while I typed I thought about this, if in verbal disagreement, red face might attack you first while the pale face may hold back and make it easier for you to attack first. Let me know what you think.
Funny, I never knew the lift the red part, but always remembered the lift the tail if the face is pale.