Final answer:
The first step in assisting a 44-year-old male with a severe leg injury from a chainsaw accident is to apply direct pressure to the wound, then ensure his airway is clear, provide oxygen if necessary, and evaluate his pulse.
Step-by-step explanation:
If you are the first responder to a scene where a patient is suffering from a severe leg injury with active bleeding due to a chainsaw accident, priority actions include: applying direct pressure to the wound to control bleeding, assessing airway patency to ensure it is not compromised, administering oxygen if available and necessary, and assessing the rate and quality of the patient's pulse.
Given the patient is conscious and breathing adequately, but diaphoretic and restless, airway evaluation would quickly follow hemorrhage control. The chaotic environment of traumatic injury requires a structured approach with the primary focus on life-saving interventions, such as hemorrhage control, before moving to detailed assessment and treatment of other injuries.