Tyler Seguin turned in his best performance of the postseason Thursday night, tallying a goal and an assist and tying for the team lead with six shots on goal, but a mental error on his part proved costly in the Bruins’ 4-3 loss to the Rangers.

Just 49 seconds after giving Boston a 3-2 lead midway through the third period, Seguin jumped out early for his next shift, drawing a two-minute penalty for too many men on the ice. New York’s Brian Boyle scored on the ensuing power play, tying the game with exactly 10 minutes to play in regulation. The Rangers would eventually win in overtime to stave off elimination in the best-of-seven Eastern Conference semifinals.

The young winger took full responsibility for the penalty after the game. Check out the video above to hear what he had to say in the locker room.