I pre-game with partners with whom I have not worked that:
(1) If I give the stopped clock signal and then I verbally give the color and point in the "correct" direction, and I am NOT looking at him when I do all of these things, that means, come to me with information only if you are at least 150% sure that I made a mistake. (I thought I made a mistake once, but I was mistaken about my making a mistake,

. But I digress.)
(2) If I give the stopped clock signal and then I verbally give the color and point in the "correct" direction, and I AM looking at him when I do all of these things, that means, if you are at least 150% sure that I made a mistake then please, by all means, come to me and give me that information and I will change my call if need be.
(3) If I give the stopped clock signal and then I do NOT give the color and NOR point in the "correct" direction, and I AM standing there looking at him holding the stopped clock signal it means that I do NOT have a clue and that the call is all yours ("white", "black", or AP).
Of course MTD, Jr., and Daryl H. "The Preacher" Long will tell you that the only mechanic I use is (3) because at my advanced age I am always clueless,

.
MTD, Sr.