How in Thor's name do Durkon's memories include the expressions of the people he couldn't see behind him?

For that matter, why do so many of those memories include Durkon's own face?

Can it be "vampire magic" calling up past events from a point-of-view outside Durkon's body and not memories in the exact sense?

No matter what it is, I've never seen anything like Rich's narrative tool of victim memories informing the vampiric soul on demand, allowing the undead to mimic the old life. It's brilliant: exposition and plot forwarding in one stroke.