That? Sounds more like science to me, but, if you're looking for a magical theory to it? [ A sniff. ] Easy enough. Beyond being able to tie lineage together? It's got life energy in it. Right spell and enough of it? You could theoretically make someone come back with it.

[ Not that he recommends it. That sounds like a messy way to bring about a reanimation spell. Still, blood tends to be used in those.

He pauses for a reaction. Huh. John tilts his hand and lifts the chair again--WHAM. ]