Having read the book back in my teen years*, IIRC the issue was more that Krishna has told Vampire A that she'll be under his protection as long as she follows his rules, but also told Vampire B he'll have salvation only when he's killed all the other vampires, including Vampire A, who's supposedly under his protection and therefore unkillable (or something). This lead to some awkwardness when they finally met up.

Hell if that's particularly obvious from the way he explained it though.

* Teenage me would have to admit to enjoying the series at the time, though even she found the growing WTF-ery of the series harder to ignore with every book.