But what should've been an inning-ending popup by North Carolina's Ryan Blake turned disastrous for Gilmore's squad as Felty misplayed the ball in the swirling wind at Boshamer Stadium.
And it sent UNC to an 11-7 victory, its second too-close-for-comfort win in two nights.
"We battled back to tie it and thought we had squeezed out of the inning," Gilmore said. "It just broke our backs."
The two-base error allowed two runs to score, giving the Tar Heels an 8-6 edge and keeping the fourth inning alive.
Chad Prosser, who was 3-for-4, followed with a two-run single, and a 6-6 tie had quickly turned into a 10-6 UNC lead.
After a come-from-behind, 11-inning win against Liberty on Tuesday, the Tar Heels staked starter Scott Manshack to an early lead, but had to stave off several Coastal rallies.
Adam Greenberg hit two solo home runs, including a lead-off homer in the first inning, and scored three times to pace UNC's offense.
"Our biggest thing today was to jump out early," Greenberg said. "We wanted to make them play from behind."
UNC's early scoring chased Coastal starter Steven Carter after just two innings. Carter went into the game with a 1.99 ERA.