When the moment comes, a hunter with his rifle may not be able to catch his breath or steady his sweaty hands. His face may turn red from blood pressure and embarrassment. In larger doses, adrenaline may cause a stroke. He may be confused. In his sights, a bush may look like a buck. He may ask why he’s there, but his motives are too complex to summarize, and giving in to the impulse to run would make him look silly.