Barely one minute into the first scrimmage of Blue Jackets’ training camp on Saturday, fourth-line center Lukas Sedlak was sent hard into the end boards, causing a “boom” that resonated throughout the rink.

“I got mad, but then I saw it was (Ryan Murray),” Sedlak said, chuckling. “He wasn’t like that before, I think. He was a nice guy, so I was a little bit surprised.”

Murray — 6-foot-1, 210 pounds — will never be described as a physical defenseman, but he’s come to this training camp knowing he needs to make noise.

Nobody’s role within the Blue Jackets’ organization has diminished more in the past 18 months than Murray’s, from a top-pairing defenseman who quarterbacks the power play to a third pairing guy whose only special-teams play is on the penalty kill.

Murray conceded to The Athletic on Saturday that he never expected to come to training camp with the Blue Jackets this fall. The trade rumors that swirled all summer made too much...