Bearden was 7 of 15 from the floor. Blake Hamilton added 17 points on 6-of-9 shooting for Buffalo (6-5).
Hall made a 3 to give Montana State a 51-50 lead with 13 minutes left. A 15-4 surge gave Buffalo a 65-55 lead midway through the second half. David Kadiri scored six points and Hamilton made a 3 during the span.
Stephan Holm's 3-pointer pulled the Bobcats to 73-68 with 1:26 left. The Bulls made 3 of 4 free throws, and Rodell Wigginton and Kadiri made jumps shots to stretch the lead to 80-71 with 18 seconds left.