There are teams that don't drive down the field and score to win the football game. Although early forms of the prevent were seen in the 1950s, the actual term didn't catch on until the late 1970s and early 1980s. When you're ahead by at least a touchdown with less than two minutes to go. When your lead is three points or less and the other team is trying to get within field-goal range. You can blitz, but your single coverage makes you vulnerable to a quick score.
Any basic defense leaves the quarterback a lot of time to exploit a lot of open space.
Jones' initial responsibility was to cover tight end Frank Wycheck , whom he left as soon as he saw the ball heading for Dyson. Jones was praised for his great individual effort. The prevent was barely mentioned. If the defense stops them, they're expected to. And you probably never will.