Source: The False Bride
Claire gets lost in the woods looking for Clarence during a lightning storm. She takes shelter beneath a fallen tree where she finds a skull and a stone. When she looks up she can see a torch coming through the forest. Assuming it is Jamie she calls out to it but soon notices that as the figure approaches it disappears and reappears.
When it gets closer the figure it that of a native with the gem around his neck. Claire realizes it is a ghost and asks what it wants. The figure turns and leaves.
The next morning, Claire wakes to find her shoes missing. She does; however, find tracks which she follows to a stream where Jamie waits. Jamie follow similar tracks to find Claire's shoes by the stream.
Claire can only assume the ghost brought her shoes there which brought Jamie and Claire back together.
When Claire goes to wash the skull in the creek she discovers he has silver fillings which won't be invented until 100 years later.
This means the man has to be a traveler like Claire.
How many travelers are there? We know of Geillis and Claire and now this man who is called Otter Tooth in the credits.