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Do not wait to see if symptoms progress to evaluate the person’s condition, initiate treatment, and monitor their progress or decline..  Talk to the person calmly. If the person is conscious, talking to them can help you to continue to evaluate their condition.  Continue to provide updates to the dispatcher on the person’s level of consciousness, their respirations, and pulse. Check and maintain a clear airway, monitor their breathing, and keep check on their circulation by checking the pulse. Monitor their level of consciousness every few minutes until the paramedics arrive. If the person vomits or is bleeding from the mouth, and there is no suspicion of spinal injury, turn the person onto their side to keep the airway clear and prevent choking.  If spinal injury is suspected and the person is vomiting or bleeding from the mouth, clear the airway if possible without moving their head, back, or neck.  Place your hands on each side of the person’s face and gently lift their jaw and open the mouth with your fingertips to clear the airway. Be careful not to move their head and neck.  If you cannot clear their airway, get help to use a log-rolling maneuver to roll them onto their side to prevent choking.  One person should try to keep the head and neck supported and in line with the back as a straight unit, while another person gently rolls the injured person onto their side.
Stay with the person until help arrives. Continue your treatment. Prevent choking.