BUFFALO – For about 20 minutes Tuesday morning, as defenseman Michael Campoli stayed motionless on the ice, the 1,000 or so fans inside HarborCenter watching a three-on-three Sabres prospects tournament barely made a sound.
Campoli, an invite to development camp, had just been hit into the boards by winger William Carrier. The defenseman managed to get up but stumbled and fell down again.
The ensuing scene, with Sabres medical staff and Buffalo Fire Department members attending to Campoli, looked frightening.
Medical personnel eventually …