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Miami Dolphins quarterback Tua Tagovailoa left Thursday night's game against the Buffalo Bills after taking a hard hit to the head midway through the third quarter.
Tagovailoa was quickly ruled out for the game with a concussion.
Tagovailoa put his head down as he ran the ball up the middle for a first down and was tackled by Bills safety Damar Hamlin with 4:24 left in the quarter.
Tagovailoa stayed on the ground and was quickly attended to by Dolphins trainers, as concerned teammates took a knee on the field.