The Skyhawks kept the game tight and never trailed by more than 12 and always found a way to whittle the deficit back to single digits.
The breaks favored the No. 2 seed, however.
With under a minute left, Logan Webb's shot lipped the rim and devolved into a free-for-all on the floor for the rebound.
The ball serendipitously found its way into the hands of a Polar Bear who immediately hit a streaking Horton for his dunk, which put Fairmont up by 10 and the game out of reach.
"You've just got to knock them down," Cabell said. "Sometimes they go, sometimes they don't. That's basketball."
Jarin Hilson also scored 17 for the Polar Bears, collecting most of his points at the foul line.
Hilson went 13-for-19 at the line - nine of those makes coming in the fourth quarter.
The Skyhawks' lone senior, Matt Dolan, scored 18 points going 12-for-12 from the free throw line.
"I didn't get the exact shot selection I wanted," Dolan said. "But I got what I needed."
The Fairmont Senior defense focused on Dolan, holding him to just 3-for-13 from the floor and 0-for-4 from behind the arc. Hilson drew the crucial assignment of containing Dolan.
"He's (Hilson) a great defender," Dolan said. "He wasn't going to give me an open shot from the outside. I've got to give it to him. He's a great defender and I wish them the best of luck as they advance in the state tournament."