Final answer:
In this scenario, the appropriate action is to prepare the patient for immediate transport.
Step-by-step explanation:
The appropriate action to take in this scenario is to prepare the patient for immediate transport.
The deterioration of the patient's mental status and the presence of bradycardia indicate a worsening condition that requires urgent medical attention. Continuing with the secondary assessment may delay necessary treatment and potentially worsen the patient's outcome.
By preparing the patient for immediate transport, the healthcare team can ensure that the patient receives timely and specialized care at a medical facility, where further evaluation and intervention can be provided.