I've had birds that either liked a call, or would not finish on the mouth call... Maybe it is due to being a different sound, or maybe it is due to my friction calls sounding better or more realistic... But if I am hunting such a bird, I will finish on the call I started with.
I would set up some brush to hide my calling, and if I have to, pick up the gun to shoot him... I would rather have a bird in range that I have to move the gun to, rather than have my gun on a bird out of range I cannot bring in.
I absolute hate sitting with my gun resting on my knee... I have had my gun down on a number of birds I have taken home, and can only think of one occasion (where the bird was not behind me) when I tried to mount my gun to a bird that moved off too fast to shoot...
And... Due to other posts on this forum, I would not be afraid to stand up on a bird to shoot him either... I believe I have missed a number of opportunities in which all I had to do was to stand up to shoot, but I was too afraid of scaring the bird off before I could fire accurately.
This year, two of my three birds, I had to make a drastic gun movement to the bird to shoot... Such types of shots are almost more like wing-shooting to me, which is one reason I am reticent to put optics on my shotgun.
I do know one thing, if what I am doing is not working, eventually I will try something else...