Summertown (2-12) appeared determined to defend their home court and trailed just 22-21 at halftime before seizing a 30-28 advantage early in the third quarter.
The Rockets, however, got their offense cranked up after that point and outscored the Eagles 38-21 the rest of the way to take home the 15-point victory.
"This is a very tough place to play. Summertown always has great crowds and great teams. I told the guys to ignore their record because they're going to give us their best shot. I was really pleased that we played a great second half," said Forrest coach Wes Hobbs. "Our depth showed up tonight. We were able to sub in a lot and wore them down in the second half. It seemed like we had the fresher legs."
Bolstered by an 11-of-16 shooting performance in the third quarter, the Rockets shot 49 percent (26-of-53) from the field overall, which included a 3-of-12 effort from three-point range. FHS also committed just 10 turnovers, outrebounded the Eagles 29-21, and held a 11-5 edge on the offensive glass.
"We wanted to get the ball inside in the second half because Lucas makes good decisions with the ball. If he gets double teamed, he kicks the ball out to open shooters. I feel our offense works better when we run it inside out," said Hobbs.
Summertown, conversely, turned the ball over 15 times and hoisted 24 three-pointers, hitting seven, en route to shooting 41 percent (19-of-46) from the floor overall.
Nate Morrison paced the Eagles with 11 points and Camden Perry notched 10 points. Seth Wright added eight points for Summertown as well, while Logan Cox and Kasen Glass each added seven points.
Forrest jumped out to an 8-4 lead midway through first quarter thanks to four points from Pruitt and baskets from Horvath and Rumley before Perry buried a trey to narrow the gap to 8-7.
After Horvath scored on a layup and Hoeft knocked down a three to give FHS a 13-7 advantage early in the second period, the Eagles tallied seven of the next nine points to cut the deficit to 15-14 with 4:15 left in the stanza.
The Rockets then rattled off seven straight points with the help of two baskets from Zimmerman and a Rumley trey to extend their lead to 22-14, but Summertown countered with a 7-0 spurt to close the gap to 22-21 at the half.
In the third, Forrest opened up a 24-21 advantage at the start of the quarter on a layup by Horvath, but the Eagles outscored FHS 9-4 over the next 2:20 to pull ahead 30-28.
Summertown, though, was unable to keep the Rockets down for long, as Forrest put together a 14-3 run behind four points apiece from Pope and Zimmerman to seize a 42-33 lead late in the third period.
The Eagles used a 7-2 spurt to whittle the deficit to 44-40 early in the fourth, but the Rockets began to pull away down the stretch and outscored Summertown 19-6 over the next 6:42 on the strength of eight points from Pope and four points from Pruitt to forge a 63-46 advantage before claiming the 66-51 victory.