Martin is willing to talk to Jack, he's not willing to be cut up or give blood. However, last Christmas present he send was a caged vampire who tasted a drop of Martin's blood.

My plan was to play into the 'vampire blood makes you stronger but also insane' bit by having Martin give drops of blood to his subjects. Turning them into unstable junkies.
His blood being a very potent addictive substance to them.