Screens can be stopped when the defense can press, but because of the bunch alignment of Decker and Welker, that option is eliminated. For the defense it’s all about rallying to the football once the catch is made. You’re not preventing the completion. You’re trying to make this a 6-yard play instead of a touchdown.
According to PFF, Demaryius Thomas led all wideouts with 697 yards after the catch, with five of his 14 regular season touchdowns including 15 or more YAC.