Hall scored 19 points with Buffalo and 14 points (eight goals, six assists) in 16 regular-season games with Boston. He scored five points (three goals, two assists) in 11 Stanley Cup Playoff games and for the first time made the second round of the NHL postseason before the Bruins lost the best-of-7 series to the New York Islanders in six games.
"Obviously finishing up against the Islanders, [Hall's] line didn't have the numbers they had against [the] Washington [Capitals] (in the first round)," Cassidy said. "Some of that is a learning curve for the player, the deepest he's been in the playoffs, usually the harder it gets as you go along. Those are some things you just have to learn on your own, I think, as a player."
Hall scored three points (one goal, two assists) in five games against the Capitals. The 29-year-old scored two points (one goal, one assist) in six games against the Islanders, the goal coming with an empty net. Hall did not score a point in the final three games, all losses.
"I think the next playoffs he's in he'll be better prepared for it," Cassidy said. "I hope it's with the Boston Bruins. He did a good job with us. He's a good player, he's a good person. He works hard. I think he knows what he wants out of his career now. He's been in a few different places. He's made some money. And hopefully both sides can make it work."
Selected by the Edmonton Oilers with the No. 1 pick in the 2010 NHL Draft, Hall has scored 596 points (228 goals, 368 assists) in 680 regular-season games with the Oilers, New Jersey Devils, Arizona Coyotes, Sabres and Bruins. He has scored 17 points (seven goals, 10 assists) in 11 playoff games.