"First and foremost is the speed," he said of the adjustment from college. "Players are more skilled and they are bigger, older, more mature. Things just happen quicker, faster, in everything. How you read the play, see the ice and make plays."
With four points (2G, 2A) points in seven B-Devils games, Walsh has acquitted himself fine. It can be tough to define expectations for a rookie pro in a normal situation. Factor in everything else this season and expectations became even more up in the air for Walsh and the rest of his teammates.
Walsh came to New Jersey with a notable backstory. His father, Mike, played with Devils GM Tom Fitzgerald in the AHL; Fitzgerald and Walsh were roommates and won the 1989 Calder Cup together in Springfield, the AHL affiliate of the New York Islanders at the time.
Mike Walsh was a forward and his decade-long pro career included two 30-goal AHL seasons and 14 NHL games with the Islanders. He also played in Sweden and Italy.
"It's pretty cool to now go through and experience the AHL like he did," said Walsh.
Mike Walsh landed at Proctor Academy, the New Hampshire prep school where he remains a teacher/coach, after he retired. It was at Proctor where Reilly and his younger brother Ronan, who will head to University of Vermont in the fall, took to hockey.
Part of Mike Walsh's guidance of his elder son was to encourage him to keep playing defense, despite the tendency for skilled players to move up as they get older, especially if a player is average size (Reilly Walsh is 6', 185 pounds).
Staying on the blueline put Reilly on the leading edge of the game's transformation, where defensemen are expected to join the rush and support the puck in the o-zone more than ever, while still maintaining their primary responsibility at the back end.
"I've learned you have to pick your spots," said Walsh, "while still not allowing them to score…possession, keeping it, is important, there is no better defense than not letting your opponent have the puck because they can't score without it."
And if Walsh continues his current arc, another objective will be met: making it to the NHL.
How close is he?
"That's a good question," says Walsh, "I don't want to say when but when (the opportunity) comes I want to be ready."