Editing Super Bowl V (section)

===Second quarter===
At the start of the second quarter, Morton was flagged for intentional grounding on third down while trying to avoid a sack by defensive tackle [[Billy Ray Smith Sr.|Billy Ray Smith]], pushing the Cowboys back to the 22-yard line and forcing them to settle for Clark's 30-yard field goal, stretching the score to 6–0.

On their next possession, the Colts offense got a break. After two straight incompletions to open the drive, Unitas uncorked a pass to wide receiver [[Eddie Hinton (American football)|Eddie Hinton]] that was both high and behind the receiver. The ball ricocheted off Hinton's hands, was tipped by Cowboys cornerback [[Mel Renfro]],<ref>With limited replay in the day, there was some controversy over whether Renfro actually tipped the ball after it bounced off Hinton's hands and into the arms of tight end John Mackey. (At the time, the rules stated that a pass could not be complete if it was touched by two offensive players in succession, without a defender touching the ball in-between; seven years later, in a rule-change dubbed the "Mel Renfro Rule", this restriction on double-touching would be scrapped prior to the [[1978 NFL season|1978 season]].) But [[Howard Cosell]] debuted an angle of the play on ABC's [[Wide World of Sports (U.S. TV series)|Wide World of Sports]] one week later which clearly showed the rotation of the ball suddenly changing as it passed Renfro's hand, proving he had indeed touched it.</ref> then landed in the arms of tight end [[John Mackey (American football)|John Mackey]], who sprinted 75 yards for a touchdown. The Cowboys subsequently blocked kicker [[Jim O'Brien (American football)|Jim O'Brien]]'s extra point attempt to keep the score tied at 6–6, with O'Brien later saying that he was "awfully nervous" and hesitated a second too long before kicking it.<ref name=OBrien/>

After the next three possessions ended in punts, Cowboys linebacker [[Lee Roy Jordan]] forced a fumble on Unitas, and defensive tackle [[Jethro Pugh]] recovered the loose ball at the Baltimore 28. Dallas capitalized on the turnover in three plays; Thomas rushed for 4 yards, then Morton completed a 17-yard pass to Reeves, followed by a 7-yard touchdown pass to Thomas to establish a 13–6 lead. The Colts reached the Cowboys' 37 on their next drive, but turned the ball over yet again, with Unitas unleashing a fluttering interception to Renfro while taking a fierce hit by defensive end [[George Andrie]]. Unitas was knocked out of the game permanently on the play with a rib injury and was replaced by [[Earl Morrall]], who was widely blamed for the Colts' loss to the [[New York Jets]] in [[Super Bowl III]]. The Cowboys, starting from their own 15, were unable to score any points off the turnover. An offensive pass interference penalty on Hayes forced Dallas to punt. Starting from their own 48-yard line, the Colts offense, now led by Morrall, began to gain momentum. Morrall completed a 26-yard pass to Hinton, followed by a 21-yard pass to wide receiver [[Roy Jefferson]]. A personal foul penalty on Jordan put the ball on the Dallas 2-yard line with less than two minutes remaining in the half and giving Baltimore a chance to tie the game. However, the Cowboys defense stiffened. Colts running back [[Norm Bulaich]] was stuffed on three consecutive rushing attempts from inside the 2-yard line. The Colts elected to convert fourth down, but Morrall threw a pass intended for tight end [[Tom Mitchell (American football)|Tom Mitchell]] that fell incomplete, turning the ball over on downs and maintaining Dallas' 13–6 lead to end the half.