A sure thing isn't always a sure thing. That Tom sees those hens and says "Okay, I've come this far, now you come to me." He'll stay in full strut, pacing back and forth.
Maybe you guys are better callers than I am....(HIGHLY possible)....BUT!!
I've never had a tom come in far enough to see my deke......and decide to commit.....BECAUSE of my calling.
I've come to the conclusion that they're either gonna commit.....or they aren't......and my calling isn't going to be the deciding factor if they DO.....but it most certainly CAN be the deciding factor of why they don't.