What happens if a Horcrux (or indeed, any other non-wizard being containing part of a wizard's soul) kills the owner of the Elder Wand?
For example, consider when Dumbledore was still the master of the Elder Wand; suppose Nagini had killed him.
Nagini is not a wizard; since only wizards can wield a wand, it would seem like the Elder wand should remain with Dumbledore forever.
On the other hand, Nagini, as a Horcrux, has a part of Voldemort's soul inside it. Would that be enough for the Elder Wand to change hands?