The Heat had an off day in New York last season on a night their G League team played in Westchester, New York. A group of Heat coaches attended. Duncan Robinson played well, but did not chase one loose ball with enough gusto for the Heat contingent. “I knew that would be the one thing they’d notice,” Robinson said. When the Heat called Robinson up, they introduced a loose ball drill to his practice regimen. A coach would roll the ball, and demand Robinson dive for it, tip it to another coach, and sprint to the corner for a catch-and-shoot jumper. Robinson got good at cushioning falls. “It’s a skill,” he said. “Don’t fall on your hip.”