Smith was replaced by William Henderson -- an alternate referee who was at the game in case of an emergency. Obviously, alternate refs never hope to be called into action, but Henderson was ready and stepped up so play could resume.
Smith has been an NCAA ref for years ... and has previously spoken about his passion for basketball and being a part of the game.
"I love being part of the game," Smith said in an article on Referee.com. "The arrival at the arena, the pregame, being with various partners, the competition, the players, coaches, ambience, the focus and concentration needed on each possession."
"It allows me the privilege to do something I love, being part of the greatest game, men’s college basketball. I also love the fact that no game is ever the same and allows us the ability to make constant improvement."