TCoT+Murdered+Cross-+country+Skier

It was 1'o clock on a snowy day when Dr. Haledjian called one suspect, for the murder of Clark Shingle, a cross-country skier. The suspect, Jones Puffin, Shingles neighbor, happened to also be cross- country skiing at the same place when the murder happened. "What is your story?" Dr. Haledjian asked willingly. Puffin admitted, "It was 3:00 pm when I went cross- country skiing. Before I went skiing, I went over to the rental shop. In there was Clark Shingle so I said hi. I got my neon green Fischer skis and walked out to the first trail called Rabbit Trail. Clark was already skiing down Rabbit Trail, but I had to first put on my boot. I clasped the front and back of my boots into the ski and started going. By then at 4:00 pm, Shingle was out of m sight. I skied for an hour and then at 5:00 pm, I went back to my hotel, took a hot shower and went to bed. In the morning, I left to go back home." Puffin finished. "You are guilty!" Dr. Haledjian admitted positively. How did Dr. Haledjian know?