Dorothy Knight was a second-generation cambion, registered with Beowulf as the matriarch of an actively-tracked bloodline. Her three children, born of her marriage to William, were the third generation — the threshold at which, according to Helen Marsden’s later analysis, cambion strength reaches a level capable of carrying what standard cambions cannot.
On 16 October 1987 at Shoreham Haven Hospital, Dorothy understood what had happened to her daughter Christine — that the brokered crossing initiated by Agrat bat Mahlat on behalf of Asmodeus had reached its terminus, and that Christine could not be saved. She acted in the same hour. The Beowulf incident report records the action plainly:
Entities confirmed: Agrat bat Mahlat (possession-class). Entity destroyed on-site by Dorothy Knight (cambion; suicide-working).
— Beowulf incident report. Cambion
The working required her own death to do it. The cost was hers; the decision was hers; she had known the cost when she made it. Her son Ben brought the building down around her in the moments that followed — an uncontrolled Class-A Kinetic/Thermal Discharge logged by Beowulf as a rage cascade following his sister’s death. The total casualty count: 683 confirmed dead, 19 missing presumed dead.
Toby extracted the infant Robert from the building. The two surviving brothers went to ground, following the instructions in their mother’s last letter.