A frightening scene played out in the first half of Sunday’s game between the Las Vegas Raiders and Baltimore Ravens.

As the second quarter came to a close, players from both teams removed their helmets and took a knee.

CBS cameras didn’t catch what happened, but the broadcast reported that someone alongside the Baltimore sideline needed medical attention. It turns out that a member of the chain-gang had collapsed.

The broadcast went to commercial without further explanation, and play resumed after a short break. CBS then reported that the official was carted off the field and moving his hands while on a stretcher.

Sideline reporter AJ Ross reported that the chain-gang member “passed out” during play, but regained consciousness. Per the Ravens, he was transported from M&T Bank Stadium to a local hospital.

The identity of the official and details of his condition weren’t immediately clear. This story will updated if more is learned about the official’s condition.