Brent Seabrook and Ryan Garbutt were jockeying for position when both men lost their footing and went sliding across the ice. Garbutt ended up in Chicago’s net while Seabrook slid and had a nasty collision with the boards.
https://www.youtube.com/watch?v=B_g-Z30Eej0
Seabrook appeared to have the wind knocked out of him. Here’s a slower version of the brutal moment of impact:
