Dan Quinn took a brutal hit from his own quarterback Marcus Mariota.The Washington Commanders backup was scrambling near the sideline and got shoved out of bounds by a Las Vegas Raiders safety Tristin McCollum.Fox SportsQuinn wasn’t going to let a head injury get him off the sidelines[/caption]View Tweet: https://t.co/f5HxgS5ZtHMariota couldn’t put the brakes on and went flying into Quinn, who was sent tumbling and lost his headset.He later appeared with a cut on his forehead.Fans were quick to comment on social media, with one suggestion the Commanders ‘get out the blue tent’ and another suggesting Quinn ‘might be concussed.’More to follow…