Harry glared at the vampire. "And there's the door, Billy-boy, so if you don't want to be around here anymore, and I wouldn't freaking blame you, you're free to go at any time." Why had he beckoned the vampire inside in the first place? Mostly to size him up, see if there was anything wrong about him. There wasn't, except for the fact that he was a vampire; he had helped Molly, for no benefit that Harry could see, but if he was just going to gripe about being in a powder keg, he could damn well leave.
He wasn't worried about Molly. He knew Molly was strong and capable. But magic was addictive as it was powerful, and Jo hadn't learned all the things his wise young grasshopper had. Harry knew that Molly had the capacity and capability to be a very, very scary person. But she was his padawan, his grasshopper, DJ Molly C. She had taken his lessons to heart, and he could trust her.
Someone else walking around with that kind of power was a risk he didn't like. And if Jo did something, even accidentally, that touched on the Laws of Magic, she, in Molly's body, could be executed by the Wardens. With Harry right beside her.
This was a bigger mess than he'd first realized.
"I can talk you through it if we need to," Harry nodded to Murphy. "It's a lot of feeling and visualization. There's just going to be a lot of hair-raising punch behind it that you might not expect."