The Sunday Night Football contest between the 49ers and Seahawks was billed as a hard-hitting slugfest between two rivals.
Thus far, it's lived up to expectations.
During the first half, Niners tight end Vernon Davis was the recipient of a bone-jarring hit, courtesy of Seattle safety Kam Chancellor.
Davis was going up to haul in a potential touchdown pass when Chancellor leveled him mid-air, causing the ball to come loose and, predictably, drawing a personal foul penalty.
In real time, it appeared to have been an illegal hit, with Chancellor aiming for the head area, always a no-no. But replay clearly showed that Chancellor made contact in Davis' chest, a legal play.
In any case, the blow concussed Davis, whose helmet smacked the cold turf. He was quickly ruled out for the rest of the game.