The way that I understand ASA, AtlSteve hit the nail on the head. It is better to have PU take the call, but that is not "by the book" and you cannot change the book before you hit the field, you make changes as they become necessary in the game, even though you make this change most every time that it happens.
By the way I had this play today in an NCAA game. I was PU and said "two man" as U1 went out but did not call U3 off. He asked me, as we were going back to our positions, if I was going to take the touch all day.
