As the fire burned through Ryan's mansion, the staff didn't leave immediately, they stayed around to make sure the fire didn't progress beyond Ryan's property before they dialed the emergency number.
Those in the neighboring houses also alerted the state's fire department of the fire, and they showed up in time to put it out.
The domestic staff stood around, watching as though they had no idea what had happened. When asked how the fire started, they said they had no idea.
When asked about the the occupants of the house, they said no one was inside since Genevieve had left early for her trip and Abigail had left for the office with Josh before the fire started.
Because of the strategic positions Abigail had set the fire, it had made a lot of impact, and effectively destroyed everything in Ryan's bedroom and study as she wanted before the fire department arrived.