Honestly, please explain a factual scenario where this is possible?

Aaron J. Long, 20, of Fairfield, Ill. was killed last Thursday night when his 16-year-old friend and hunting partner mistook Long for a wild turkey and shot him in the back with an arrow.

Wayne County Sheriff Jim Hinkle said Long had been hunting near the Sam Dale Lake State Park with several friends Thursday evening. Long was pronounced dead at 7 p.m. when officers arrived on scene.

“Mr. Long was sitting on a small ridge when his 16-year-old friend walked up on him and mistook him for a wild turkey,” Hinkle said. “He was struck in the upper back and died at the scene.”

The accident is being investigated by the Illinois State Police, the Illinois Department of Natural Resources and Wayne County Coroner Jimmy Taylor.

From here.

Exactly what sequence of events could lead you to confuse a human adult male with a wild turkey at archery range? Horrible, for everyone involved, but such an incredible waste.