On Presbyterian's possession in the second OT, Ryan Singer was sacked by Scott Hyland for a loss of 12 on third-and-10 from the Liberty 11. The game ended when Singer's pass went incomplete on fourth-and-22.
Liberty (6-3, 4-0 Big South Conference) led 13-10 with 1:32 left in regulation. Presbyterian (2-6, 1-2) drove 50 yards on seven plays, capped by Aaron Mayes' 22-yard field goal to send it into overtime with 5 seconds left.
Allen had 131 yards and two touchdowns on 26 carries.
Singer had 114 yards on 12 of 26 passing and 108 more on 16 carries.