The Comanches - ranked No. 2 in Class 2A, Division I - led the Pirates by 11 at halftime and Poth had momentum following an interception and field goal to close the second quarter.
Junior Dalton Brooks told his brother Doug, "gimme one" before Shiner's first defensive possession.
Shiner (4-0) would go on to score on two safeties by Doug Brooks and a 16-yard interception return by Drew Wenske, while allowing minus-11 yards in the second half to cruise by Poth 39-10.
Shiner's defense scored a total of four times, and Poth was limited to 123 yards of total offense.
"We went to the locker room and we knew we were ahead, but we weren't thinking that," Doug Brooks said. "We came out and knew we had to make a play, big plays turn the game. We needed momentum."
Doug Brooks would add on a 6-yard touchdown run in the fourth quarter for his only offensive score of the game.
Shiner, which was limited to 184 yards of offense, had to utilize all three phases of the game.
Junior Dalton Patton delivered back-to-back punts to Poth's 1-yard line to set up Brooks' safeties. Patton's first boot went 73-yards, flipping the field and momentum after both teams traded punts to start the second half.
"That was huge because we needed a momentum swing," said Shiner coach Daniel Boedeker. "On the defensive side, we needed some good things to happen. It started with Dalton's punts, then the safeties and we got the pick-six later on. Once we figured it out, our defense played lights out."
Dalton Brooks also wanted to make sure the Comanches started the game on the right foot after falling behind to San Antonio Davenport early in last week's contest.
Dalton Brooks rushed for 94 yards and a pair of touchdowns in the first half, finishing with a game-high 110 yards on 14 carries.
"In the past few weeks, we hadn't come out and scored touchdowns," Dalton Brooks said. "To get those, it was real critical. It just started the game right for us."
The Comanches also got a good test from Poth's defense in the first half, which limited Shiner to 142 yards through the first two quarters.
After graduating 22 seniors from last year's Class 2A, Division I state championship run, Shiner sees the experience from its tough non-district slate as invaluable.
"With the last two games we had, we overcame adversity," Doug Brooks said. "You have to capitalize on the mistakes that are made. We worked on that in practice and today it showed."
Shiner hosts Burton on Friday.
Sam Fowler is a sports reporter for the Victoria Advocate.
He may be reached at sfowler@vicad.com, 361-580-6576,
or on Twitter @FowlerSports14.
GAME STATISTICSsource: Victoria Advocate Game Statistics, September 18, 2021 Shiner 39, Poth 10 Friday, September 17, 2021, 7:30 p.m. Jack Lane Stadium, Poth SCORING SUMMARY 1 2 3 4 F Shiner 14 7 4 14 -- 39 Poth 7 3 0 0 -- 10 SCORING DETAILS: First Quarter S: Dalton Brooks 43 run (Ryan Peterson kick), 6:38 S: Dalton Brooks 3 run (Peterson kick), 2:19 Second Quarter P: Zane Raabe 16 run (Seth Drzymala kick), 10:25 S: Eli Fric 89 interception return (Peterson kick), 2:15 P: Drzymala 35 field goal, 0:00 Third Quarter S: Zane Raabe -1 run, safety, 7:16 S: Caleb Molina -1 run, safety, 4:51 Fourth Quarter S: Drew Wenske 16 interception return (Patterson kick), 9:40 S: Doug Brooks 6 run (Patterson kick), 5:45 TEAM STATISTICS: Shiner Poth First downs 9 11 Yards rushing 33-184 36-111 Yards passing 0 12 Passes 0-2-0-0 1-9-0-2 Punts 4, 50.8 4, 43.3 Fumbles-lost 1-1 2-1 Penalty-yards 8-85 4-35 INDIVIDUAL STATISTICS: Rushing Shiner: Dalton Brooks, 14-110-2, Doug Brooks 13-65-2; Poth: Zane Raabe, 16-59-1, Jude George, 11-20; Passing Shiner: Drew Wenske, 0-2-0-0-0; Poth: Jude George, 2-7-12-0-1; Receiving Poth: Caleb Molina, 1-12