Jason nodded. He didn't entirely know how it happened. But it did, when a person was fully possessed their blood became changed. No explanation had ever been found. But this was not the focus now.
"The current working theory - and this comes solely from Ms. Gordon's apparant experience with this..." he looked for the right word. "Woman, is that she is not only supplying him with the blood, but is also acting as either his partner or pushing him farther down this path. Given his recent activities," he indicated the folder, "the first is more likely," the sigh came before he could stop it. Despite what everyone said, Jason Blood was old. He really was. Even if he didn't look like it. "Demons have been around for thousands of years, Bruce. Millions even. It is just a question of when they are going to rise. There have always been demons in Gotham. Its just a matter of keeping them at bay. But now... For some reason this Samuel Winchester is gathering them all. It seems he is the leader... she would be the... power behind the throne?"
He glanced over at his friend, trying to read him. "Bruce? These are not entities that you are used to fighting," he warned. "They are different than anything you have ever seen before..."