Harbaugh on Monday again hit on one of the key plays of Sunday’s win.

Late in the first half, it appeared Justin Herbert fumbled while getting hit. Tennessee picked up the loose ball and scored to tie the game at 13.

But officials ruled Herbert threw an incomplete pass on the play as the Bolts maintained possession and the lead. The Chargers eventually pulled away from the Titans in the second half.

Harbaugh raved about Herbert’s incredible feat, especially considering he was being hit by Titans defensive tackle Jeffrey Simmons, one of the league’s top defensive players.

“Justin held onto that ball when nobody would have held onto that ball,” Harbaugh said. “The way he was hit and his arm was hit, it’s impossible to hold onto that ball. If it were anybody else but him, they would have fumbled immediately.”

Harbaugh then divulged he asked Herbert at halftime how he was able to hold into the ball with such strength.

“Carrying the bricks, Coach,” Harbaugh said Herbert told him.

That led Harbaugh to delve into a three-minute story about bricks.

About how wide receivers coach Sanjay Lal likes his position group to carry bricks to improve grip strength.

About how Chargers equipment assistant Chad Jessop went to The Home Depot this offseason to make sure Lal had the necessary equipment for the Bolts wideouts.

And about how Herbert then began carrying the thick, 30-pound bricks on his own as a way to enhance his own grip strength.

“He would see the receivers do it and then he would go do it,” Harbaugh said. “He was really good at carrying those bricks.”

We’ll never know how the Bolts would have responded if they had possibly trailed 14-13 at halftime yesterday.

Instead, they caught a break and ran with it.

“That’s the kind of stuff that inspires you,” Harbaugh said. “That might have been the key play of the game. Maybe the key play of the season, we don’t know. It’s going to be one of them when all is said and done.

“No matter how well we do, we’re going to look back and say that was one of the key plays of the season,” Harbaugh added.