While a bunch of neighbors were finishing a late night dinner on the patio of a home, a man wearing a ski mask and carrying a gun visible to all leaped onto the patio and demanded money, threatening to shoot someone if his demand was denied.  The man took off his ski mask and took some chicken wings.  After eating a few of them he commented the food was very good. The neighbors offered him more food, and he put his gun in his belt.  He apologized and told them he had come to the wrong house.  The man left, stealing nothing and hurting no one. 
Did the person commit the crime of attempted robbery or robbery under the MPC?  Can he argue successfully that he abandoned his criminal activity before a crime was committed?