Out at 3D coarse today and came upon a big buck laying down. Buck jumped to his feet and hammered down his feet and gave me a huge grunt like I have never heard before. He then hammered his feet again staring at me. I thought he was going to charge me. Then he turned and ran. I could hear him grunting for a good 2 minutes as he was getting farther away. It was very interesting experiance I must say.