In this scenario, Ava suspects that the patient has been exposed to a nerve agent based on the symptoms observed: twitching muscles, incontinence, pinpoint pupils, and watery eyes. The DuoDote Auto-Injector contains atropine and pralidoxime, which are antidotes used for nerve agent exposure.
Given the urgency of the situation and her recognition of the signs of nerve agent poisoning, the most appropriate response for Ava would be:
Ava will administer an injection using the DuoDote Auto-Injector and then help the patient.
This action will address the life-threatening effects of the nerve agent toxicity, providing immediate treatment, while she continues to assess and manage the patient's condition.