Robert Brown|Tagovailoa diagnosed with concussion after hitting his head on the turf, leaves Dolphins-Bills game

MIAMI GARDENS,Robert Brown Fla. (AP) — Miami Dolphins quarterback Tua Tagovailoa has been diagnosed with a concussion for the third time in his NFL career, leaving his team’s game Thursday night against Buffalo after running into defensive back Damar Hamlin and hitting the back of his head against the turf.

Tagovailoa remained down for about two minutes before getting to his feet and walking to the sideline after the play in the third quarter. He made his way to the tunnel not long afterward, looking into the stands before smiling and departing toward the locker room.

The Dolphins needed almost no time before announcing it was a concussion. The team said he had two during the 2022 season, and Tagovailoa was diagnosed with another concussion when he was a college player at Alabama.

He signed a four-year, $212 million extension before this season — a deal that makes him one of the highest-paid players in the NFL — and was the NFL’s leading passer in Week 1 this season. Tagovailoa left with the Dolphins trailing 31-10, and that was the final score.

Tagovailoa’s college years and first three NFL seasons were marred by injury, though he positioned himself for a big pay bump with an injury-free and productive 2023 as he led the Dolphins into the playoffs. He threw for 29 touchdowns and a league-best 4,624 yards last year.

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When, or if, he can come back this season is anyone’s guess. Tagovailoa was hurt on a fourth-down keeper with about 4:30 left in the third. He went straight ahead into Hamlin and did not slide, leading with his right shoulder instead.

He wound up on his back, both his hands in the air and Bills players immediately pointed at Tagovailoa as if to suggest there was an injury. Dolphins center Aaron Brewer quickly did the same, waving to the sideline.

Tagovailoa appeared to be making a fist with his right hand as he lay on the ground. It was movement consistent with something that is referred to as the “fencing response,” which can be common after a traumatic brain injury

Tagovailoa eventually got to his feet. Dolphins coach Mike McDaniel grabbed the side of his quarterback’s head and gave him a kiss on the cheek as Tagovailoa departed. Skylar Thompson came into the game to take Tagovailoa’s spot.

Hamlin was the player who suffered a cardiac arrest after making a tackle during a Monday night game in January 2023 at Cincinnati, causing the NFL to suspend a pivotal game that quickly lost significance in the aftermath of a scary scene that unfolded in front of a national television audience.

Tagovailoa’s history with concussions — and how he has since worked to avoid them — is a huge part of the story of his career, and now comes to the forefront once again.

He had at least two concussions during the 2022 season. He was hurt in a Week 3 game against Buffalo and cleared concussion protocol, though he appeared disoriented on that play but returned to the game.

The NFL later changed its concussion protocol to mandate that if a player shows possible concussion symptoms — including a lack of balance or stability — he must sit out the rest of the game.

Less than a week later, in a Thursday night game at Cincinnati, Tagovailoa was concussed on a scary hit that briefly knocked him unconscious and led to him being taken off the field on a stretcher.

His second known concussion of that season came in a December game against Green Bay, and he didn’t play for the rest of the 2022 season. After that, Tagovailoa began studying ways where he may be able to fall more safely and protect himself against further injury — including studying jiu-jitsu.

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