Original: Kelsey wanders from the tour and attempts to phone her friend, but disturbs an unknown beast, the Bane Mother, to the annoyance of the staff, to which Wormwood orders the alarms switched off and Sarah Jane killed.
Simplified: Kelsey gets bored and walks out of the tour to phone her friend, but disturbs the Bane Mother. Mrs Wormwood tells her staff not to ring any sirens and to kill Sarah Jane Smith.