Dilemma #1: "That's My Deer!"

You’re bowhunting when a nice buck walks by your tree stand, stops at about 15 yards, and quarters away. You make a great shot in the vital area of the rib cage. The deer takes only six more quick steps before dropping dead! You wait long enough to be sure he’s finished. You climb down from your stand, approach the animal, and begin to admire the first deer you have ever taken with a bow. At that instant, another bowhunter runs toward you with a bloody arrow in his hand yelling, “That’s my deer!”
What would you do?