The man had come to Tesla, who he had known as being a covert, doctor reserved for the rich with... questionable methods. He had revealed to him that there were other side affects. If he hadn't seen them himself, he would have thought that he was insane. However this side effect meant that for a moment whenever he was using these... side effects, his heart rate was so slow it was almost non-existent. Tesla saw how he could use this to his advantage.
So he gave the businessman an offer, a possible cure that would prevent him from going into the remission that other doctors said was definitely on the horizon, and the ability to look and feel 30 for years, as well as a life span that no other human could hope to enjoy. All that he needed was his signature.
Years later, when Tesla was looking back after another failed attempt at bringing back the vampire race, he would allow himself a little silent amusement at the irony that the businessman's name, was Vlad.
