That makes no sense. First, Bellatrix is not dead (or whatever state Voldemort is in). Second, she could have had no contact with Hermione before escaping Azkaban.
Lucius thinks in terms of plots within schemes within intrigues; he does not necessarily assume that the body in Azkaban belongs to the real Bellatrix Black, or that the escape was real.
Or that Hermione was possessed by Bellatrix in the same way that Harry Potter was presumably possessed by Voldemort.
That makes no sense. First, Bellatrix is not dead (or whatever state Voldemort is in). Second, she could have had no contact with Hermione before escaping Azkaban.
Lucius thinks in terms of plots within schemes within intrigues; he does not necessarily assume that the body in Azkaban belongs to the real Bellatrix Black, or that the escape was real.