>> 33-year-old richard gaudry taunts police by dangling his 2-year-old son out a third-story window, holding him with just one hand. >> he was shaking the baby by the ankle, moving around. the baby was crying. once we were there, we didn't really want to look at him. >> in his other hand, the desperate dad holds a knife to his 2-year-old's throat. >> he had a knife in his hand. the knife was at the baby, and threatening to drop the baby. it was pretty horrific. >> it all begins about an hour earlier, after the father, upset over losing custody of his son, grabs the baby from his mother and begins using him as a pawn while he vents his rage. the police and fire departments respond. officers stay calm and try to talk to the knife-wielding man. >> he would lean over, wave the knife at me, and he was threatening to kill the baby. i was just talking to him, trying to keep him calm, trying to keep things so that they didn't explode and get worse than what they were. >> sharpshooters take up positions, and the distraught dad makes one concrete demand, beer. >> he threw a $10 bill at me and