Chicago Blackhawks defenseman Brent Seabrook high and late hit on David Backes has cost his team dearly.

Chicago had a 3-2 lead at 15:09 of the third period when Seabrook was assessed a five-minute major. St. Louis forward Vladimir Tarasenko tied the game on the resulting power play en route to a 4-3 overtime win that put the Blues up 2-0 in the series.

Now Chicago will have to fight its way back without the aide of Seabrook, who has been assessed a three-game suspension for his actions.

The NHL determined that Seabrook had enough time to avoid the check after Backes skated by the puck, but instead he “delivered a violent blow that causes the defenseless Backes to crash dangerously into the boards.”

Seabrook hadn’t previously been fined or suspended, which presumably worked in his favor, but the NHL also factored in that Backes suffered an injury.

It remains to be seen whether Backes will be available for Game 3.