Palmer was throwing the ball better than people believe this season, but the team's lack of pass protection and erratic running game has limited the Cardinals' offense (Palmer entered Sunday third in passing yards and tenth in yards-per-attempt). But the struggling line and poor running game showed up again in London, where the Rams started to get consistent pressure on him in the second quarter. The injury came on a play where the Cardinals atypically left seven men in to block a Rams blitz. The pressure still got to Palmer, with Rams linebacker Alec Ogletree delivering the decisive blow.