This looks really dangerous, and no one can deny that it's a dirty play.
He didn't stop there.
Later, he gave multiple dangerous cross-checks on Michael Bunting :
Hitting a player that's on the ground isn't very sportsmanlike.
The Department of Player Safety should make a decision in the next few hours about Bennett.
But, as reported by Chris Johnston:
"As unhappy as the #leafs were with Sam Bennett's cross-checks on Bunting and the takedown on Knies, it seems unlikely he'll be suspended for either infraction.
We'll see where @NHLPlayerSafety lands after working through their process."