Jacksonville Jaguars quarterback Trevor Lawrence appeared to sustain a bad ankle injury from his own teammate when Walker Little stepped back onto him in Monday night's game against the Bengals.
Lawrence's own bodyweight then appeared to force his ankle to twist further, before Bengals player Trey Hendrickson fell on top of him, inadvertently compounding the injury further.
Lawrence at first stayed down in pain, tried to get up and then crumpled back to the ground and threw his helmet to the floor and punched the ground, with his face a mix of pain and frustration.
The initial concerns are that Lawrence has sprained his ankle and, according to Tom Pelissero of NFL Plus, the 24-year-old will have an MRI on Tuesday to learn the true extent of the damage.
He needed to be helped away from the field by two trainers but was moving very slowly and went immediately for an X-ray as the stadium fell silent.
Trevor Lawrence appeared to badly hurt his ankle in the fourth quarter of Jaguars vs Bengals
Quarterback Lawrence had his right ankle stepped on by his teammate, Walker Little
In deeply concerning scenes for the Jaguars, Lawrence needed a lot of help down the tunnel
Lawrence was visibly in pain when he was being treated on the field on Monday night
Lawrence needed two trainers to help him off the field and he went straight for an X-Ray
Lawrence beat the turf in dismay after trying and failing to walk on his injured ankle
The stadium fell silent in Jacksonville as star man Lawrence was helped from the field
The Jaguars said he was questionable to return with around three minutes left in the game but he didn't return. Lawrence was clearly done for the night as he was filmed wincing in pain trying to move down the tunnel.
Curiously, Lawrence hobbled down the tunnel with the aid of two trainers rather than the team getting a cart for him to avoid risking aggravating the injury.
To add insult to injury for Lawrence, his team would go on and lose the game 34-31 to the Bengals in overtime.
The Jaguars headed into Monday night's game 8-3 for the season with seven wins from their last eight.
But if Lawrence is anywhere near as badly hurt as he looked, it would be enough to derail their hopes for the rest of the season.
C.J. Beathard made his way out onto the field for the Jaguars to replace Lawrence, with Beathard facing up against Jake Browning of the Bengals - themselves without first choice quarterback Joe Burrow.
It appeared to be a costly night for the Jaguars, who also lost wide receiver Christian Kirk on the first play of the night to a groin injury.
Little, who trod on Lawrence's ankle, also then sustained a hamstring issue.