The entire San Francisco 49ers sideline left the bench Sunday to surround rookie defensive tackle Gracen Halton as he was carted off the field with a serious-looking left leg injury.

The injury came with 3:57 left in the fourth quarter against the Las Vegas Raiders, with San Francisco leading 38-17. Halton was engaged in a block when Raiders defensive lineman Keion White inadvertently rolled into his leg.

Halton went down and stayed there, and a cart was brought onto the field as the 49ers’ medical staff worked on him. An air cast was placed on his left leg, and Halton was visibly emotional as he was prepared to leave the field.

Fellow Oklahoma product Trent Williams was one of the first teammates to reach him, helping Halton up so he could get onto the cart.

The rest of the 49ers followed, with players and coaches leaving the sideline to huddle around the rookie, who has been known around the team for his infectious personality.

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