A​ 42-year-old man has fallen from a steel beam at a construction site and landed on jagged metal below. He is awake but slow to respond. His skin is​ pale, cool, and diaphoretic. He is able to​ speak, and his respirations are about 24 breaths per minute. His radial pulse is weak and rapid. He has large lacerations to his torso and lower extremities. Which should you do​ first?