Tua Tagovailoa leaves Dolphins-Bills game with head injury after taking a hard hit from Damar Hamlin

Down 31-10 in the second half, Tagovailoa picked up a first down on a fourth-and-4 scramble and took a hard shot to the head as the Bills' Damar Hamlin tackled him.

The Miami Dolphins' rough night only got tougher.

Down 31-10 in the second half,Tua Tagovailoa picked up a first down on a fourth-and-4 scramble and took a hard shot to the head as the Buffalo Bills' Damar Hamlin tackled him. He did not return to the game.

It didn't get much better from the Dolphins from there in a 31-10 Bills win. They have now won 12 of their past 13 games the Dolphins, who are once again facing concerns both about Tagovailoa's durability and their track record against good teams under Mike McDaniel.

After a promising 7-1 start to last season, the Dolphins went 2-6 in their final eight games, which included a disastrous showing in the wild-card round against the eventual Super Bowl champion Kansas City Chiefs at Arrowhead Stadium. They are 0-2 against the Chiefs and 1-3 against teams that made the playoffs last season overall.

The Dolphins will be hoping for a better fate this time around, especially with Tagovailoa, who has struggled with injuries throughout his career and had a particularly rough outing in the second half of this game. He threw an interception on the opening drive of the second half to help Buffalo extend its lead.

Meanwhile, the Bills got off to a hot start thanks in no small part to James Cook, who scored three touchdowns in the first half to help Buffalo build a 24-10 halftime lead in an important early-season matchup. Both teams made the playoffs last season, and both were knocked out by the eventual Super Bowl champion Kansas City Chiefs — Miami lost in Kansas City in one of the coldest games in NFL history in the wild-card round and Buffalo lost at home the following week.