Doctor Dodge lives in a cabin on the edge of a large lake. One day, a man comes to his cabin and knocks on the door, in a panic. When Doctor Dodge opens the door, he says, "Help, help! Assassins are chasing me and I need somewhere to hide!" Doctor Dodge thinks for second and pulls out a bamboo pole with the diameter of a quarter and a five-foot length. He says, "Take this pole and jump into the lake. You can breathe through this and the assassins won't see you." The man thanks Doctor Dodge and jumps into the lake with the pole. Later, Doctor Dodge hears the sound of footsteps and gunshots outside his window fading in and out of distance, who he thinks come from the assassins. The next day, a park ranger finds the body of the man floating on the surface of the lake. There are no marks on the body and after an autopsy, it is discovered he died from poisoning (not drowning). However, the bamboo pole he was holding did not have any poison in it, nor did it have any holes or crevices. After Doctor Dodge was questioned about the incident, he was immediately arrested for murder. How did he kill the man?