Tua Tagovailoa went into the fencing response against the Buffalo Bills after suffering yet another scary concussion.
The Miami Dolphins quarterback took a huge hit at the end of the third quarter by the Bills' Damar Hamlin, who himself suffered a cardiac arrest on the field in January 2023.
Tagovailoa appeared to go straight into the fencing response, before cameras quickly cut away from the incident.
He was able to leave the field under his own steam, before returning to the locker room with trainers.
Within six minutes of him leaving the field, he had been diagnosed with a concussion and it was relayed to broadcasters Amazon Prime that he would not return to the game in the second half.
Tua Tagovailoa was hit in the head by Damar Hamlin, with both players traveling at speed
Players quickly called for help for Tagovailoa after he went into the fencing response
Tagovailoa has suffered two known concussions in the NFL in recent years, and his 2022 season was cut short by head injuries.
In Week 3, he was rocked by a huge tackle and went into the fencing response, but later returned to the game.
In Week 4, he exhibited concussion symptoms again after another brutal hit and was stretchered from the field.
Later in the season, in Week 16, he suffered yet another concussion, which ended his season.
Other players took a knee as medics rushed to Tua, before he then left under his own steam
It is the third known concussion that Tagovailoa has suffered in his fledgling NFL career
Tagovailoa didn't miss a game in the 2023 season after bulking up over the summer, but he reported for the most recent preseason with a significantly slimmed-down frame.
The scary moment in Thursday night's Week 2 match-up between the Dolphins and the Bills involved Tagovailoa and Hamlin, two of the most-injured players in the NFL in recent years.
Both have suffered severe internal injuries from playing football, with Hamlin's cardiac arrest in January 2023 rocking the entire sport.
It was initially thought he would never return to the field, after his life was miraculously saved by hero medics on the field in Cincinnati, but he is now back starting games for the Bills.