"A quiet caution, a wave of the hand or just... "the look"... should be all that is necessary for the dog to be reminded of it's training. IMO of course.
I remember once at the OH-PA Championship, I found a Smith setter on point. I don't remember why I was out there except that I was running the trial and could go wherever I d^mn well pleased! :-)
Anyway, I whoaed the dog pretty firmly and rode to where I could get Harold Ray's attention and signaled him. Then I rode back and whoaed the dog again. Again "firmly!" Harold got there with a judge and flushed the bird. Got RU with that dog iirc!
Did I do right? I didn't owe Harold or Mrs. Smith anything but I really felt that the dog should be rewarded for digging up that find. He was well off the beaten track, driven there by his desire to find birds imho. I can see him now in my mind's eye, standing facing a woods edge, head and tail high, a pretty sight. Harry