Grapevine tied the game at 21 before Heritage scored three touchdowns in the final four minutes of the second quarter to take control.
Thomas had touchdown passes of 26 and 80 yards in the final minute of the half.
“They gave us the pass tonight,” Thomas told the paper. “We have a great running game, but tonight they gave us the opportunity to throw it and the receivers made plays.
FOREMAN SPARKS COMEBACK
On Monday, Texas City junior wide receiver Armanti Foreman became the first player to commit to OU for the 2014 class.
Friday night, Foreman sparked a comeback that fell just short as Texas City lost to undefeated Dawson, the top-ranked 4A team in Texas, 32-29.
With his team trailing by 16 in the fourth, Foreman returned a kickoff 67 yards for a touchdown to start the comeback.
Foreman finished with four catches for 28 yards and a pair of carries for 35 yards.
His twin brother D'Onta had 76 yards rushing, scoring a late touchdown to pull Texas City within three points.