I didn't mean for the dog to go for an unprotected arm. It just seemed to make sense to me that the dog should be trained to go for the arm with the weapon - in which case, both arms should be protected during training. As someone said, Schutzhund is not about training a protection dog so it's irrelevant really. It was just an observation on my part.
I am a total newbie and not at all familiar with Schutzhund but I am trying to learn and understand. We all have to start somewhere