Well... Okay, of course I'm assuming that I - that he was. I mean, just look.

[Russell gestures, and a triad of bones appear in the air. They float to the side, hitting the wall, and slide up it until Russell gestures down at them.]

Bones! Animated bones. That's the simplest explanation, isn't it?

[That, and it's a little more flattering to himself, to imagine that this other-him in these transplanted memories is the agent behind what he's seeing... as opposed to, he guesses, some skeletal zombie who goes for tea parties.]

Assuming they're even all memories from the same person. But, adding more characters to this story, when I haven't even seen them...