in experimentation of the new Nidbanes, myself and a friend decided to test out the creatures. I attacked her (the assault scent cannot be used) and knocked her out to get the Battery scent.
I picked up my own scent and discovered the Nidbane crafting items, the Dolmen and the Fetter. When she picked up the scent, she did not discover it. She relogged and tried again and still no discovery.
We thought maybe only one person can discover per scent, so another character came over and discovered it after I had, and then my alt came over and made the same discovery as well. So more than one person can use the same scent to discover the items. It seems that when an assault is committed against you, the scent does not provide the discovery for the Nidbane items.
We'll post a couple little screenies of menus without the items and the scent on the ground in a moment.