"Jawad Williams is killing us out there," he said to his assistants.
The halftime line on Williams: 11 points on 4-of-6 shooting, including 3-of-4 from behind the 3-point arc, in 10 minutes of play.
No wonder Gillen was frustrated.
The UNC forward made his first appearance with 12:17 remaining in the first half and the score tied at 11. After a Virginia basket, Williams scored eight points in 1:18, and North Carolina went on an 8-0 run.
Twice during the run, point guard Melvin Scott penetrated along the baseline, forcing Virginia's defense to collapse and leaving Williams wide open at the top of the key. Both times, Scott kicked the ball out and Williams calmly knocked down the 3-pointer.
"Jawad was very big for us," said UNC point guard Adam Boone. "He hit a lot of 3s from the trailer position."
Williams also made a layup that was set up by rapid perimeter ball movement and a crisp entry pass from Will Johnson.
Despite his performance, Williams was quick to deflect the credit to his teammates.
"By the point guards pushing it, it put a lot of pressure on the man who was guarding me to help," Williams said. "When he helped, I was wide open."