The football gods aren't letting Percy Harvin succeed this season. This is just his second game, and he got knocked out temporarily in the first quarter thanks to a hard collision. He came back only to take another hit to the head with the mouthpiece again leaving his mouth. It looks like he'll probably be out of the game too:

UPDATE: It's confrimed. Harvin is out for the game with a concussion.

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[via GIFD Sports]