Which rules do you enforce

[DG]

Originally Posted by SanDiegoSteve

Another one...if neither teams says anything about the "gorilla arm" do you just let it go until the other team asks you to enforce it?
I apologize for being really dense here, but I don't recall the term. Can someone tell me what "gorilla arm" translates into?

From the 2005 Interps:

SITUATION #5: While in the set position, F1 has his pitching hand down in front of his body, swinging slowly as he gets the sign from the catcher. RULING: The use of this “gorilla” stance in the set position is illegal. A pitcher, for the set position, shall have his pitching hand down at his side or behind his back. (6-1-3)