IDAHO FALLS — In what appeared at halftime to be the makings of the upset of the season, 5A Hillcrest held a 31-28 lead over Rigby — which had already clinched the 6A District 5-6 championship. Rigby (7-1, 2-0) came back in the second half, outscoring the Knights (5-3, 3-1) 21-8 after the break for a 49-39 victory. And the key to that comeback was the Trojan defense’s efforts against Hillcrest quarterback Tyson Sweetwood. RELATED | Rigby hands Hillcrest its first home loss in 49-39 battle Sweetwood said after the game that he thought his team “played great” against the larger Trojans. “We know…