 Late in the third quarter, he was hit in the chest by Kentucky defensive end Taylor Wyndham, fell backwards, and hit the back of his head on the knee of Florida tackle Marcus Gilbert, who was wearing a hard knee brace.Upon impact, Tebow briefly displayed a prominent fencing response with his left arm, indicating that a concussion had taken place.He lay motionless for several minutes before being helped to the sidelines, where he vomited.