After Lipscomb's Malcolm Smith made a layup to draw the game to its fourth tie, 27-27, Hall converted two free throws that sparked a 16-5 run for the Bears.
Hall had eight points during the run and Smith added a 3-pointer.
Mercer (13-9, 6-3) shot 34.8 percent (8 of 23) in the first half but hit 11 of 16 after intermission en route to its third win in four games.
Deonte Alexander's 20 points led Lipscomb (8-12, 3-6), which made 9 of 31 second-half shots.
Mike Brey is looking at former Notre Dame players to fill two assistant jobs that have opened up with the departures of Martin Ingelsby and Anthony Solomon.
Purdue's 2016-17 prospects got a jolt Wednesday when forward Caleb Swanigan announced he will return for his sophomore season.
Clemson's Jaron Blossomgame says he is withdrawing from the NBA draft and returning to school for a final season.