On Saturday night, 18-year-old defenseman Matthew Schaefer gave him a textbook example. Schaefer, the Islanders’ top draft pick in June, had a difficult opening period in the preseason finale, a 4-3 win against the Philadelphia Flyers. But rather than let the rough start sink his night, Schaefer regrouped and settled in as the game went on — something his head coach noticed right away. And the reason why I’m saying this is I lived it when I was playing,” Roy said. “I was 20 years old when I started playing NHL and there was nights where you could lose your confidence very easily.