In a surprising turn of events at the NHL development camp, a jaw-dropping hit unfolded, breaking the usual unwritten code among teammates.

Toronto Maple Leafs prospect Roni Hirvonen found himself on the receiving end of a bone-crushing collision with his own teammate, Nolan Dillingham.

The impact was so forceful that Hirvonen was sent sprawling to the ice, lying motionless.

While Hirvonen eventually managed to leave the ice under his own power, the somber news emerged that he had indeed suffered a concussion.

This incident serves as a shocking reminder of the physical risks associated with the game of hockey, even if it's in practice.