it is not helplessness. It is sheer ignorance.
They saw it coming....everybody was seiing it coming.
First thing to do would be to put yourself in the dogs line of vision. Turn around, turn the dog around and put it nose against your legs.
The confontation being unavoidable, you never try to separate the dogs by pulling on the leash or collar, much less one dog only.
You are betraying that dog and it either bites harder or it lets go and the other dog profits from that and bites again and harder.
Only way to do is to have one person behind each dog and both, at the same time, lift both dogs hind legs and twist their hind quarters.
Dogs feel they loose balance, both at the same time, and both open their mouths and let go.
As simple, and evident, as that.
i think handlers should be taught and qualified before they enter the show ring......