After pinning Knies to the boards, Bennett decided that wasn't enough and hurled Knies into the ground with a disturbing and unnecessary amount of force. Knies landed headfirst and was clearly disoriented from the brutal attack.
In a disgusting display of incompetence, bias or both, no penalty was called on the play. However, Bennett may still face much needed additional discipline for his actions.
Sure, The Panthers are known for their brutal and relentless playstyle, but they still must adhere to the rules, like every other team, and show proper respect and restraint towards the other team. This was a clear cause for penalty that was ignored, and it's absolutely deplorable that no penalty was called. The NHL needs to address this.