VANCOUVER -- With a giant crash, the relaxed atmosphere at the Calgary Flames' morning skate disappeared in an instant.
A hard shot shattered a pane of glass at GM Place as practice wound down.
The perpetrator was delighted.
It wasn't Dion Phaneuf and his point-shot rocket.
The shot was neither a Jarome Iginla wrister nor a Robyn Regehr slapper.
It was assistant coach Rob Cookson who did the honours, while helping Chuck Kobasew work on his deflection skills.
"A heavy shot," Cookson said with a grin.
"Actually, that's the second pane of glass I've broken. It happened once in Calgary.
"It's a tribute to Rich Hesketh's fitness program."
And a good source of fun for the boys.
Cookson is a health fanatic but his forte is running, not feats of strength.
"It was coming at my head so I had to get out of the way," said Kobasew, feigning fear.
"It must have hit the circle in the glass where they talk to the ref or he must be doing wrist curls."
"It took me a second to realize the glass was coming down, until I saw it exploding all over the ice."
Flames players were laughing about the incident.
Cookson can expect some playful chiding over the next few days.
"It must have been worn down on that spot or something," said Iginla, whose hard shots have smashed a pane or two in the past.
Chimed in Regehr: "He was probably using an illegal puck. Or there was a stress crack from a concert.
"The only thing I've seen Cookie break is a sweat in the steam room."
Upon entering the dressing room after the session, Cookson was approached by assistant equipment manager Mark DePasquale and was told: "You've got to pee. They want to make sure you're not on steroids."