I think you are missing my point. How is dueling someone with a bible( which has zero damage) in order to lose to lower ones duel level not considered a push? You are effectively losing on purpose and pushing duel experience on others that may not wish their own duel levels to increase.I guess pushing is legal as long as you are gaining an advantage by losing the duel.
But I am sure that is one of many workarounds I have always been puzzled about here. Just like inno s can not be bothered to release a bug free quest or be bothered to even run text through a free spell check program.