Or just a few seconds after Crimson quarterback Collier Winters zipped a 31-yard pass down the middle of the field to freshman H-back Kyle Juszczyk for Harvard’s sixth touchdown.

The final 15 minutes of play, Spisak was merely an observer as the Ivy League co-leaders closed out a 42-21 victory over Dartmouth in front of 8,107 at the Stadium, Harvard’s 12th win in its last 13 meetings with the Big Green.

“It was nice to be a spectator for once,’’ said the 6-foot-3-inch, 280-pound senior with a smile of satisfaction.

Spisak and his seasoned mates, senior tackles James Williams and John Paris, along with the guards, senior Ben Sessions and junior Brent Osborne, ruled the line of scrimmage. They paved the way for a season-high 309 yards on the ground and a slew of openings for freshman Treavor Scales (20 carries, 120 yards, 2 TDs) and junior Gino Gordon (8-113, 3 TDs), the first pair of Harvard backs in 10 years to rush for 100-plus yards in the same game. And their snug protection allowed Winters (12 for 15, 204 yards) to operate efficiently.

“We consider ourselves the best line in the league . . . we take it upon ourselves to make sure that Gino and Treavor get 100 yards, and Collier gets all the time in the world,’’ said Spisak, who pulled out to deliver the key block on the Crimson’s first touchdown, allowing Scales to knife through the Dartmouth defense for 40 yards.

On Harvard’s next series, blocks by Williams, along with reserve fullback Anthony Rotio downfield, sprung Gordon for a 15-yard scoring jaunt around right end, and a 14-0 lead. Then Scales turned battering ram, bowling over Aaron Limonthas on third and 1 for a 21-0 spread with 1:33 left in the half.

“We got physically beat up,’’ summed up Dartmouth coach Buddy Teevens. “They just ran the ball up and down the field on us.’’

Harvard coach Tim Murphy said line play is the difference between his Crimson (5-2, 4-0) and the Big Green (1-6, 1-3).

“We have four seniors, they have four sophomores, they’re going to be tremendous in two years,’’ he said.

But not yet. One week after Dartmouth sophomore Nick Schwieger rushed for a school-record 242 yards in a breakthrough win against Columbia, the tailback was forced to the sideline early in the second quarter with a right hand injury. His 10 carries netted a meager 18 yards, bottled up by a Crimson front seven that was inspired and unyielding, allowing 64 yards on the ground.

“We were making [Dartmouth] play, to a certain extent, lefthanded, taking away the run as much as possible,’’ said Murphy, who saluted a gritty group of linebackers that were without starters Alex Gedeon (season-ending broken elbow) and Conor Murphy (ankle).

The Crimson, meanwhile, continued to plow ahead.

On the first series of the second half, Gordon darted through a mammoth opening on the right side created by the 6-5, 285-pound Osborne and sprinted 48 yards to the end zone for a 28-7 cushion.

“My success today goes toward the offensive line,’’ said the 5-11, 185-pound Gordon, who closed out an impressive performance with an 8-yard scoring run midway through the third quarter. He also piled up 103 yards on four catches, becoming the first Crimson back on record to have 100 yards rushing and receiving in the same game.

“They opened up the holes for me, and the wide receivers don’t get enough credit for the work they do blocking downfield, creating space,’’ said Gordon.

Only the Crimson special teams had a forgettable day. Harvard missed a short field goal, allowed Dartmouth to pick up a third-quarter first down on a fake field goal, and watched Big Green senior Peter Pidermann charge in to block a fourth-quarter punt, resulting in Michael Reilly’s 16-yard scoop and sprint for the final TD.