Penalty killing is built on structure, patience, and protecting the middle of the ice. In this sequence, the Buffalo Sabres abandon all three principles, creating an easy scoring opportunity for Montreal.

As the Canadiens gain possession below the goal line, both penalty killers lose their positional discipline. The strong-side defender leaves post support to pressure below the goal line, while the weak-side defender cheats toward the anticipated release option. With both players vacating their responsibilities at the same time, the slot is left completely exposed.

Montreal immediately recognizes the breakdown and attacks the middle ice with a seam pass through the penalty kill structure, leading to a high-danger chance and an easy finish.

This clip is a great teaching example of why penalty kill structure must remain intact under pressure. Aggressive reads can be effective, but only when layers of support are maintained. The priority on the PK is protecting the slot and forcing opponents to low-percentage areas.